Checkpoint source 7 workflows and in-progress diagram authoring redesign

Preserve current core, source, REST, desktop, recovery, documentation and validation work, including AGENTS.md and the development summary. This is a work-in-progress checkpoint: the new compact palette has outstanding compilation errors and native acceptance; earlier passing gates retain their documented scope.
2026-09-10 10:06:55 -07:00
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+# Basic editing native contract
+
+Status: standalone `-D warnings` compilation, self-check, generation and exact baseline check passed on 2026-09-07. Native execution remains pending. This fixture does not establish acceptance by itself.
+
+`harness/basic-editing-contract.rs` owns an independent UUID namespace. It generates six seed elements and four views, with **none** of the Entity/Actor/new Activity/counterpart the operator must create. The first view UUID is a valid SA StateMachine view with an actual machine, region and state; the next is SA Capabilities. The desired OA and SA Allocation views follow. Capabilities legitimately admits SystemActor, but is an unchosen nonpreferred view; the state view is the strong incompatible-destination counterexample. The unplaced OA Activity **Report status**, unrelated OA capability and SA function distinguish context filtering from global browsing. A second source retains a Unicode comment and CRLF bytes.
+
+Build the standalone checker only after the root grants a brief direct-rustc lease; it does not write Cargo outputs. Use the currently verified matching `oa_core` and `serde_json` rlibs, the toolchain's clang linker, `--edition 2024 -D warnings`, and output `.local/native-qa/basic-editing-contract.exe`. Then:
+
+```powershell
+. .local/toolchain/env.ps1
+.local/native-qa/basic-editing-contract.exe self-check
+.local/native-qa/basic-editing-contract.exe generate harness/fixtures/basic-editing/base
+.local/native-qa/basic-editing-contract.exe check baseline harness/fixtures/basic-editing/base/project.arcadia
+```
+
+Generation refuses an existing directory. Copy the **whole** generated base directory into a fresh native working directory. Preserve the base and all measured Save checkpoints. Do not edit an expected payload to match observed output.
+
+## Minimal native sequence
+
+Use the **Operational rescue architecture** view at 1100 × 700. Set 100% and note the camera and canvas origin. The selected redesign uses a **36 px contextual side palette**, explicitly expandable to **156 px**, with tooltips and selected-tool feedback. Entity, Actor, Activity and applicable connections belong here; advanced general inventory remains available elsewhere. Only explicitly expanding/collapsing the palette may resize the canvas. Arming a tool, choosing a point, editing a name, validation, commit and cancellation must retain its origin and camera. This interaction contract follows [the native benchmark and redesign decision](../../release-capella-basic-editing-20260907.md); it does not imply the new executable has passed.
+
+1. Choose **Entity** in the palette, click the intended canvas point, type **Rescue team** in the in-place name editor and press **Enter**. No placeholder element is accepted before Enter. Observe the clicked position and stable origin through all four phases. Set its placement properties to **x=120, y=120** for the exact persisted oracle. Save a copy; `check entity ENTRY` must pass. Undo creation before changing properties, or capture the exact command boundary separately: creation itself must be one model+placement undo. A second cancelled creation must add nothing.
+2. Choose **Actor**, click a blank canvas point, name **Control centre**, Enter; then use ordinary **Activity** creation for **Assess incident**, in that order. After each creation, explicitly set placement coordinates respectively **680,120** and **160,300**. These are ordinary root creations and remain unallocated. Do **not** use the participant's contextual **Add activity** in this oracle sequence: that separate action intentionally creates work plus an Allocation atomically and is covered by the supplementary matrix below.
+3. Use Add existing from this view; find **Report status** by name/alias. The SA function and OA capability must not appear as suggested compatible choices. Place the existing Activity and set its placement to **680,300**. Its seeded identity `b451c000-0000-4000-8000-00000000001e` must remain unchanged. Showing already placed entries must offer Locate instead of a duplicate placement.
+4. Explicitly create Allocation **Rescue team → Assess incident**, naming it **Performs** in the relationship form. Choose **Interaction** from the same contextual palette and draw **Assess incident → Report status**; retain its generated engineering name **Interaction: Assess incident → Report status**. Then select the Activity, press **F2**, enter **Assess rescue incident** in place and press **Enter**; its original alias and the authored Interaction name remain unchanged. Save; `check basic ENTRY` must pass.
+5. Select **Rescue team**, create its SA counterpart, explicitly choose **SystemActor**, **Selected only**, and destination **System rescue architecture**. Apply must reveal this Allocation view, select the resulting **Rescue team** SystemActor and retain a typed trace. Both decoy views remain byte-for-byte unchanged. Save; `check transition ENTRY` must pass. The core's explicit destination placement starts at **60,60**, size **224×94**; no observed geometry is imported into the prediction.
+6. Undo the whole transition and Save: `check basic ENTRY`. Redo and Save: `check transition ENTRY`. Reopen that entry and run the same check. Reopening counterpart creation should expose the existing counterpart, not silently create a duplicate.
+
+Run one meaningful move at 100% and one with pan/zoom, restoring the declared coordinates before the final oracle. Check one rejected raw property or creation draft: typing Delete/arrows must stay inside its focused text field; attempted unrelated selection/action must retain its raw text and a reachable correction/cancel route. These camera, focus and click-position observations are separate native evidence, not implied by saved JSON.
+
+## Supplementary redesign acceptance
+
+Run these on fresh copies or restore the preserved main-sequence state afterwards. The existing checker remains unchanged. **Supplementary accepted model changes need their own independently prepared expected model and source bundle before any exact-data claim.** UI observations and before/after byte equality for a cancelled action are narrower evidence; they do not prove a new model-producing workflow.
+
+| Case | Native action and observable result | Exact-data boundary |
+| --- | --- | --- |
+| F2 and keyboard focus | Select an existing node, F2, edit its label, Enter; one rename undo. Repeat F2 with a long name, arrow/Delete editing and Escape; original label retained, no canvas deletion or movement. | Main step 4 covers the declared Activity rename. Additional committed names require a separate expected edit; cancellation must retain the prior model and source bytes. |
+| Escape before and after point | Arm Entity then Escape before clicking; separately arm, click, type a partial name and Escape. Neither accepts a placeholder or placement; Select/move becomes reachable. | Compare each cancelled case with its complete pre-case bundle. No new expected object is allowed. |
+| Explicit allocated work | On OA Entity/Actor choose **Add activity**; on SA System/SystemActor choose **Add function**. The editor names the performer; Enter creates root work, its graphical presence and an explicit Allocation as one undoable action. Compare with ordinary palette work creation, which stays unallocated. | These participant actions are **not** represented by the existing `basic` oracle. Prepare independent expected identities, relation metadata and placement policy before claiming exact Save/Undo/Redo. Do not silently substitute them for step 2. |
+| Fixed canvas origin | At wide size and 1100 × 700, record canvas origin at idle, tool armed, point chosen, name edited/rejected, Enter and Escape. Repeat with the palette held at 36 px and at 156 px; only its explicit width toggle may resize the canvas. | Visual/pointer evidence must establish stable origin and clicked position. Existing final world coordinates stay literal; do not adjust them from observed rendering. |
+| Long names and edge placement | Choose a point near each relevant canvas edge, type a long name and inspect editor clamping, readable text, Enter/Escape and access to the chosen point. | Cancellation compares against the pre-case bundle. Committed extra objects require a separate expected model, not the current fixture oracle. |
+| Draft recovery | Before Enter, preserve a checkpoint with exact raw name, chosen point and intended tool; recover and inspect the reconstructed in-place editor. Also cover a pending F2 rename and explicit allocated-work draft if implemented. Recovery must not accept a placeholder or execute the pending command. | Independently specify/compare the full pending draft and accepted baseline first. A subsequent committed rename or allocated-work recovery requires its own expected model/source; no such supplementary recovery pass is claimed here. |
+
+## What equality proves
+
+The checker reads new UUIDv4 identities only through exact literal kind/layer/name, relationship endpoint, placement diagram+element and OA/SA trace roles. Each role must be unique, fresh relative to the fixture and distinct from every other role. It constructs every other field through typed core commands, independently fixed names/coordinates/default sizes and an explicit core transition request. The complete Project **and** complete two-file SourceBundle must match, including unused seed records, all placements, aliases, trace baseline, source ordering and included comment bytes. Final equality also rejects any unclaimed extra object or UUID.
+
+No geometry is normalized. Explicit final placement properties make the full persisted comparison reproducible without pretending that coordinates copied from the actual model prove a correct click transform. Separate visual evidence must establish the original clicked spot and stable camera. Save/Undo/Redo checks must preserve distinct copies; checking only the final state does not prove history.
+
+## Frozen seams / review boundaries
+
+The existing oracle pins ordinary root creation: raw name retained exactly, whitespace-only refused, core `make_element` alias, parent `None`, one CreateElement+default CreateNode batch, no insertion layout or implied allocation, exact world point and stable camera. The redesign changes its interaction order to tool → point → in-place name → Enter, not these expected records. Its additional explicit participant Add activity/function action has a separate atomic-allocation contract and must not alter this oracle's ordinary-creation expectations. Existing placement adds only a node. The transition oracle requires the explicit core destination request, not first-UUID fallback. No native pass for the redesign is claimed here.
+
+The self-check supplies deliberately false role-carrier geometry/metadata, verifies the oracle does not adopt it, verifies complete basic and transition source fixed points, rejects an unrelated metadata edit, and checks the actual incompatible state-view counterexample. It also pins the legitimate Capabilities participant admission rather than weakening the core to match an incorrect test assumption. A native placement alias collision uses the UUID-derived suffix predicted from the proven new placement identity; the observed alias is never copied.
+
+Final compilation took 6.691 seconds. Checker SHA256: `EFB96BD5C96F4346474F9DDFA053C53584D5F75E984258E9B8F48DB4837D3FBA`; harness source SHA256: `9AB6C2D0CDED28A7F94A24F01D5E91709BCCE5D6B648C188DA62A7EB66D890F8`. `manifest.json` pins all three generated baseline files. Logs: `.local/native-qa/basic-editing-contract-build5.log` and `basic-editing-contract-selfcheck5.log`; earlier failed attempts remain preserved (missing explicit imports, missing seed Region, temporary-UUID alias collision and the incorrect Capabilities-refusal expectation were harness-only corrections).
@@ -0,0 +1,167 @@
+{
+  "schema_version": 7,
+  "id": "b451c000-0000-4000-8000-000000000001",
+  "alias": "basic_editing",
+  "name": "Basic rescue architecture",
+  "description": "",
+  "elements": {
+    "b451c000-0000-4000-8000-000000000014": {
+      "id": "b451c000-0000-4000-8000-000000000014",
+      "alias": "basic_20",
+      "name": "Decoy operating modes",
+      "description": "",
+      "parent": null,
+      "body": {
+        "Sa": {
+          "Shared": "StateMachine"
+        }
+      }
+    },
+    "b451c000-0000-4000-8000-000000000015": {
+      "id": "b451c000-0000-4000-8000-000000000015",
+      "alias": "basic_21",
+      "name": "Standby",
+      "description": "",
+      "parent": "b451c000-0000-4000-8000-000000000016",
+      "body": {
+        "Sa": {
+          "Shared": {
+            "State": {
+              "kind": "State",
+              "entry": "",
+              "exit": "",
+              "do_activity": ""
+            }
+          }
+        }
+      }
+    },
+    "b451c000-0000-4000-8000-000000000016": {
+      "id": "b451c000-0000-4000-8000-000000000016",
+      "alias": "basic_22",
+      "name": "Main",
+      "description": "",
+      "parent": "b451c000-0000-4000-8000-000000000014",
+      "body": {
+        "Sa": {
+          "Shared": "Region"
+        }
+      }
+    },
+    "b451c000-0000-4000-8000-00000000001e": {
+      "id": "b451c000-0000-4000-8000-00000000001e",
+      "alias": "basic_30",
+      "name": "Report status",
+      "description": "",
+      "parent": null,
+      "body": {
+        "Oa": "Activity"
+      }
+    },
+    "b451c000-0000-4000-8000-00000000001f": {
+      "id": "b451c000-0000-4000-8000-00000000001f",
+      "alias": "basic_31",
+      "name": "Rescue capability",
+      "description": "",
+      "parent": null,
+      "body": {
+        "Oa": "Capability"
+      }
+    },
+    "b451c000-0000-4000-8000-000000000020": {
+      "id": "b451c000-0000-4000-8000-000000000020",
+      "alias": "basic_32",
+      "name": "Unrelated function",
+      "description": "",
+      "parent": null,
+      "body": {
+        "Sa": "Function"
+      }
+    }
+  },
+  "relations": {},
+  "diagrams": {
+    "b451c000-0000-4000-8000-000000000002": {
+      "id": "b451c000-0000-4000-8000-000000000002",
+      "alias": "basic_view_2",
+      "name": "A · Operating modes (not an architecture destination)",
+      "description": "",
+      "layer": "Sa",
+      "projection": {
+        "StateMachine": {
+          "machine": "b451c000-0000-4000-8000-000000000014"
+        }
+      },
+      "view_options": {
+        "hidden_edges": [],
+        "relation_kinds": "All",
+        "work_categories": "All",
+        "participant_categories": "All",
+        "coverage": "All",
+        "work_contexts": "All",
+        "exchange_labels": "Name"
+      },
+      "nodes": {},
+      "routes": []
+    },
+    "b451c000-0000-4000-8000-000000000003": {
+      "id": "b451c000-0000-4000-8000-000000000003",
+      "alias": "basic_view_3",
+      "name": "B · Capabilities (not an allocation view)",
+      "description": "",
+      "layer": "Sa",
+      "projection": "Capabilities",
+      "view_options": {
+        "hidden_edges": [],
+        "relation_kinds": "All",
+        "work_categories": "All",
+        "participant_categories": "All",
+        "coverage": "All",
+        "work_contexts": "All",
+        "exchange_labels": "Name"
+      },
+      "nodes": {},
+      "routes": []
+    },
+    "b451c000-0000-4000-8000-000000000004": {
+      "id": "b451c000-0000-4000-8000-000000000004",
+      "alias": "basic_view_4",
+      "name": "Operational rescue architecture",
+      "description": "",
+      "layer": "Oa",
+      "projection": "Allocation",
+      "view_options": {
+        "hidden_edges": [],
+        "relation_kinds": "All",
+        "work_categories": "All",
+        "participant_categories": "All",
+        "coverage": "All",
+        "work_contexts": "All",
+        "exchange_labels": "Name"
+      },
+      "nodes": {},
+      "routes": []
+    },
+    "b451c000-0000-4000-8000-000000000005": {
+      "id": "b451c000-0000-4000-8000-000000000005",
+      "alias": "basic_view_5",
+      "name": "System rescue architecture",
+      "description": "",
+      "layer": "Sa",
+      "projection": "Allocation",
+      "view_options": {
+        "hidden_edges": [],
+        "relation_kinds": "All",
+        "work_categories": "All",
+        "participant_categories": "All",
+        "coverage": "All",
+        "work_contexts": "All",
+        "exchange_labels": "Name"
+      },
+      "nodes": {},
+      "routes": []
+    }
+  },
+  "artifact_links": {},
+  "traces": {}
+}
@@ -0,0 +1,108 @@
+arcadia 7;
+project basic_editing "Basic rescue architecture" id "b451c000-0000-4000-8000-000000000001" {
+    include "rationale.arcadia";
+    description "";
+
+    sa_state_machine basic_20 "Decoy operating modes" id "b451c000-0000-4000-8000-000000000014" {
+        description "";
+        parent none;
+    }
+
+    sa_state basic_21 "Standby" id "b451c000-0000-4000-8000-000000000015" {
+        description "";
+        do_activity "";
+        entry "";
+        exit "";
+        kind State;
+        parent @basic_22;
+    }
+
+    sa_region basic_22 "Main" id "b451c000-0000-4000-8000-000000000016" {
+        description "";
+        parent @basic_20;
+    }
+
+    oa_activity basic_30 "Report status" id "b451c000-0000-4000-8000-00000000001e" {
+        description "";
+        parent none;
+    }
+
+    oa_capability basic_31 "Rescue capability" id "b451c000-0000-4000-8000-00000000001f" {
+        description "";
+        parent none;
+    }
+
+    sa_function basic_32 "Unrelated function" id "b451c000-0000-4000-8000-000000000020" {
+        description "";
+        parent none;
+    }
+
+    diagram basic_view_2 "A · Operating modes (not an architecture destination)" id "b451c000-0000-4000-8000-000000000002" {
+        description "";
+        layer Sa;
+        projection {
+            StateMachine {
+                machine @basic_20;
+            };
+        };
+        routes [];
+        view_options {
+            coverage "All";
+            exchange_labels "Name";
+            hidden_edges [];
+            participant_categories "All";
+            relation_kinds "All";
+            work_categories "All";
+            work_contexts "All";
+        };
+    }
+
+    diagram basic_view_3 "B · Capabilities (not an allocation view)" id "b451c000-0000-4000-8000-000000000003" {
+        description "";
+        layer Sa;
+        projection Capabilities;
+        routes [];
+        view_options {
+            coverage "All";
+            exchange_labels "Name";
+            hidden_edges [];
+            participant_categories "All";
+            relation_kinds "All";
+            work_categories "All";
+            work_contexts "All";
+        };
+    }
+
+    diagram basic_view_4 "Operational rescue architecture" id "b451c000-0000-4000-8000-000000000004" {
+        description "";
+        layer Oa;
+        projection Allocation;
+        routes [];
+        view_options {
+            coverage "All";
+            exchange_labels "Name";
+            hidden_edges [];
+            participant_categories "All";
+            relation_kinds "All";
+            work_categories "All";
+            work_contexts "All";
+        };
+    }
+
+    diagram basic_view_5 "System rescue architecture" id "b451c000-0000-4000-8000-000000000005" {
+        description "";
+        layer Sa;
+        projection Allocation;
+        routes [];
+        view_options {
+            coverage "All";
+            exchange_labels "Name";
+            hidden_edges [];
+            participant_categories "All";
+            relation_kinds "All";
+            work_categories "All";
+            work_contexts "All";
+        };
+    }
+
+}
@@ -0,0 +1 @@
+// Preserve this included engineering note: rescue 雨.
@@ -0,0 +1,17 @@
+[
+  {
+    "path": "expected-baseline.json",
+    "bytes": 4524,
+    "sha256": "F239E728D650B0AF32BB8F3DCAF6B27C99B9C5041132AC14E51756EA6563D978"
+  },
+  {
+    "path": "project.arcadia",
+    "bytes": 3077,
+    "sha256": "045CB047D7BFBCA72C3FB30DB4C81A30AD463D3AF7FC51604906AD7FA75A1FF8"
+  },
+  {
+    "path": "rationale.arcadia",
+    "bytes": 57,
+    "sha256": "C01867C9DC0D40726853119FAC3C6AD24A40D8D362A93A8B9D20DF04EC2E273F"
+  }
+]
@@ -0,0 +1,115 @@
+# Source7 native acceptance fixture
+
+This is the frozen baseline for separately scoped native cases. Current passes
+and remaining rendering/workflow gates are recorded in the
+[native acceptance report](../../release-source7-native-acceptance-20260907.md);
+fixture generation alone is not native acceptance. `base/project.arcadia` and its included
+`rationale.arcadia` contain43elements and9relations: OA and SA callers each reuse
+an A→B→C procedure twice and through one nested wrapper. A direct X contribution
+allows a caller link specifically into B. The SA boundary has two parameterless
+operations and a correlated Reply. All identities are deterministic.
+
+Copy the complete `base` directory into a fresh working directory per case. Keep
+the baseline unchanged. `harness/source7-native-contract.rs` generates it and
+checks actual saved results against an independently constructed complete model
+and source update. It refuses migration, UUID stabilization or whitespace
+normalization. Current exact baseline generation and comparison passed against
+the source7 core; this does not constitute UI acceptance.
+
+Cases for the actual compiled desktop:
+
+- `operation-reset`: edit the first existing Call (`@operation_probe_43`) to
+  select Reset's exact allocation (`@operation_probe_30`). Reply remains
+  independently identified and derives this Call's operation. No new model
+  records are expected.
+- `operation-status`: on a separate baseline copy, select ReadStatus's allocation
+  (`@operation_probe_31`) on the same Call. Its authored message name is retained.
+- `oa-link` / `sa-link`: in the appropriate `@oa_caller` / `@sa_caller`, create
+  one contextual Precedence from direct `@oa_x` / `@sa_x` into B through the first
+  reference R1. Enter name `First assessment gate` and guard `Check accepted`.
+  Repeated reference R2 and the procedure definition must remain unchanged.
+- `oa-nested` / `sa-nested`: target B through R3 and its Inner assessment reference.
+  The exact two-component instance path is required.
+- `baseline`: Undo the one accepted edit, save, and compare all model/source
+  bytes. Redo and saved reopen must return the same accepted identity and fields.
+
+For creation checks, exactly one newly allocated v4 relation UUID is permitted.
+Only that fresh nonce is read from the native result; every authored field,
+alias, owner, path, purpose, dependency and complete source update is predicted.
+No existing identity or unrelated record is excluded from comparison. Preserve
+the accepted files/hashes to prove that Redo/reopen retain this allocated UUID.
+
+Build the checker using the current source7 core library and matching serde_json
+library, then run `CHECKER generate NEW_DIRECTORY` or
+`CHECKER check MODE WORKING_DIRECTORY/project.arcadia`. Source6 teaching and
+historical recovery oracles remain in their separate fixture directories.
+
+## Additional purpose cases: validated oracles, native pending
+
+New source in `harness/source7-native-contract.rs` adds two independent incidence
+oracles. Direct-rustc `-D warnings` compilation passed in4.05s during a coordinated
+brief lease; both purpose self-checks passed. Existing base bytes and its manifest
+remain unchanged. Native purpose authoring/history is not yet accepted.
+
+Validated checker: `.local/native-qa/source7-native-contract-incidence.exe`, SHA256
+`16994DC437F5CCC5E5F6FBB4212C03449F2389AE4615FA98B2930B3637468EE3`.
+The original checker remains unchanged at SHA256
+`4AC615A099F23A78F111BAD3966A3CCB808FCA1C5FC46FBAC9A947508A568600`.
+Logs: `.local/native-qa/source7-incidence-{build,selfcheck,generation}.log`.
+Generated separate fixture `.local/native-qa/source7-incidence-base` passed the
+complete baseline check; entry SHA256
+`77C26FD2DD71514AB89C0FA71113825AC8F3DBD8F71A56EFAE8E5430C92D99B8`.
+Regenerated original baseline matched all three manifest hashes; preserved native
+OA-link and operation-Reset accepted cases also passed the extended checker.
+
+To reproduce, build the checker against matching current core/serde libraries, preserving the
+old checker executable, and first run `CHECKER verify-incidence-contract`. This
+constructs expected typed commands, proves complete core analysis with exactly
+one assembly record and unchanged precedence/entries/exits, checks invalid
+direction/work counterfactuals, and checks stable source updates. Native check
+modes predict the entire Project and two-file source bundle; only the new link's
+v4 nonce is taken from actual output, never its name, endpoints, purpose or evidence.
+
+### OA Exchange assembly
+
+Run `CHECKER generate-incidence NEW_DIRECTORY`; this separate deterministic variant
+adds one Interaction, `@oa_assessment_handoff`, **Assessment handoff X to B**,
+from `@oa_work_x` to `@oa_work_b`. It contains43elements/10relations/two sources.
+Do not replace `base` with this variant. Check the clean copy with
+`CHECKER check incidence-baseline NEW_DIRECTORY/project.arcadia`.
+
+In OA caller, choose **Tools → Qualified link / assembly…**. Set source to direct
+X (`[]/oa_x`); Choose target → Enter First assessment → B (`[oa_r1]/oa_b`). Enter
+name **Caller assessment handoff**. Choose **Exchange assembly** and first leave
+evidence empty: Apply must refuse. Then select the exact **Assessment handoff X to B**
+Interaction; Apply should become available. Apply once and Save a fresh copy.
+
+Run `CHECKER check oa-exchange-assembly SAVED/project.arcadia`. Undo/Save uses
+`incidence-baseline`; Redo/Save uses `oa-exchange-assembly` and must preserve the
+same accepted UUID/bytes. The link is incidence: no precedence arrow/guard or
+merged execution is inferred. Core proof checks its exchange contributes to this
+caller’s behavior coverage, not the shared procedure’s global coverage. The
+reversed contextual endpoint counterfactual must be rejected; deleting the
+evidence exchange removes its dependent incidence link (automated oracle only).
+
+### SA Common work incidence
+
+Use a fresh copy of the original unchanged `base`, not the exchange variant.
+In SA caller, choose **Tools → Qualified link / assembly…**. For source Enter
+First assessment → B (`[sa_r1]/sa_b`); for target return Root then Enter Second
+assessment → B (`[sa_r2]/sa_b`). Enter name **Shared assessment work** and select
+**Common work incidence**. Choosing **X · Check authorization** (`@sa_work_x`)
+as evidence must reject; repair to exact **B · Review assessment** (`@sa_work_b`).
+Both full reference paths must remain distinct while the shared work identity is
+the same. Apply once and Save a fresh copy.
+
+Run `CHECKER check sa-common-work SAVED/project.arcadia`. Undo/Save uses `baseline`;
+Redo/Save uses `sa-common-work` and exact accepted UUID/byte comparison. This records
+shared identity; it neither fuses the two occurrences nor creates execution order.
+The complete-model oracle rejects renamed/duplicated work, collapsed instance
+paths, wrong evidence or unrelated record changes.
+
+After compiling, also regenerate original `generate` into a fresh scratch folder
+and compare its three hashes with the existing manifest, then rerun a preserved
+old accepted case. These checks establish that extending the checker did not alter
+the already-measured baseline or existing expected results.
@@ -0,0 +1,936 @@
+{
+  "schema_version": 7,
+  "id": "52060906-0000-4000-8000-000000000001",
+  "alias": "source7_native_contract",
+  "name": "Reusable procedures and operation identity",
+  "description": "",
+  "elements": {
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+      "id": "dc17769b-7e1e-5f15-99bb-0caf98bcb006",
+      "alias": "oa_a",
+      "name": "A · Begin assessment",
+      "description": "",
+      "parent": "af139b27-7e42-5729-9e49-53b2ac62c9e7",
+      "body": {
+        "Oa": {
+          "Shared": {
+            "Occurrence": {
+              "body": {
+                "Action": {
+                  "action": "25fdfe13-c45d-5822-830a-192ff13f660d",
+                  "lifeline": null
+                }
+              },
+              "precondition": "",
+              "postcondition": ""
+            }
+          }
+        }
+      }
+    },
+    "e16033cd-3184-56ef-b462-5559ad212c84": {
+      "id": "e16033cd-3184-56ef-b462-5559ad212c84",
+      "alias": "oa_inner",
+      "name": "Inner assessment",
+      "description": "",
+      "parent": "273d8df8-83c8-5d75-99d1-59a7c9fdb705",
+      "body": {
+        "Oa": {
+          "Shared": {
+            "Occurrence": {
+              "body": {
+                "SequenceReference": {
+                  "sequence": "af139b27-7e42-5729-9e49-53b2ac62c9e7"
+                }
+              },
+              "precondition": "",
+              "postcondition": ""
+            }
+          }
+        }
+      }
+    },
+    "e21febd2-30ec-5e9d-aa4c-3c54c95c2c9f": {
+      "id": "e21febd2-30ec-5e9d-aa4c-3c54c95c2c9f",
+      "alias": "sa_inner",
+      "name": "Inner assessment",
+      "description": "",
+      "parent": "7932ab3a-6b60-5059-a3a0-fca3a2f9a197",
+      "body": {
+        "Sa": {
+          "Shared": {
+            "Occurrence": {
+              "body": {
+                "SequenceReference": {
+                  "sequence": "c1d4eda2-fac7-5621-a7ac-25f985911bf5"
+                }
+              },
+              "precondition": "",
+              "postcondition": ""
+            }
+          }
+        }
+      }
+    },
+    "e78d841a-a37e-5106-8356-b1e3ce6d2501": {
+      "id": "e78d841a-a37e-5106-8356-b1e3ce6d2501",
+      "alias": "oa_work_x",
+      "name": "X · Check authorization",
+      "description": "",
+      "parent": null,
+      "body": {
+        "Oa": "Activity"
+      }
+    },
+    "ef2a06af-6013-5f0b-a56d-db705f0685ce": {
+      "id": "ef2a06af-6013-5f0b-a56d-db705f0685ce",
+      "alias": "oa_b",
+      "name": "B · Review assessment",
+      "description": "",
+      "parent": "af139b27-7e42-5729-9e49-53b2ac62c9e7",
+      "body": {
+        "Oa": {
+          "Shared": {
+            "Occurrence": {
+              "body": {
+                "Action": {
+                  "action": "a39639dc-0ece-5b71-981d-c9523fed4914",
+                  "lifeline": null
+                }
+              },
+              "precondition": "",
+              "postcondition": ""
+            }
+          }
+        }
+      }
+    },
+    "fc986c5c-eae7-5363-bcd5-b832d565a89a": {
+      "id": "fc986c5c-eae7-5363-bcd5-b832d565a89a",
+      "alias": "oa_r3",
+      "name": "Nested assessment",
+      "description": "",
+      "parent": "2100ac23-79ee-54e1-b3cf-69f3d4f3b30a",
+      "body": {
+        "Oa": {
+          "Shared": {
+            "Occurrence": {
+              "body": {
+                "SequenceReference": {
+                  "sequence": "273d8df8-83c8-5d75-99d1-59a7c9fdb705"
+                }
+              },
+              "precondition": "",
+              "postcondition": ""
+            }
+          }
+        }
+      }
+    }
+  },
+  "relations": {
+    "0fc11ada-23a6-5f39-9891-e7f363a1edfb": {
+      "id": "0fc11ada-23a6-5f39-9891-e7f363a1edfb",
+      "alias": "oa_a_then_b",
+      "name": "a then b",
+      "description": "",
+      "body": {
+        "SequenceLink": {
+          "source": "dc17769b-7e1e-5f15-99bb-0caf98bcb006",
+          "target": "ef2a06af-6013-5f0b-a56d-db705f0685ce",
+          "guard": ""
+        }
+      }
+    },
+    "169f558e-a466-5fcc-b0d7-53e481952714": {
+      "id": "169f558e-a466-5fcc-b0d7-53e481952714",
+      "alias": "oa_b_then_c",
+      "name": "b then c",
+      "description": "",
+      "body": {
+        "SequenceLink": {
+          "source": "ef2a06af-6013-5f0b-a56d-db705f0685ce",
+          "target": "c40c2011-4497-52f0-9e0e-10323b3150a8",
+          "guard": ""
+        }
+      }
+    },
+    "52060906-0000-4000-8000-00000000001e": {
+      "id": "52060906-0000-4000-8000-00000000001e",
+      "alias": "operation_probe_30",
+      "name": "InterfaceItemAllocation 30",
+      "description": "",
+      "body": {
+        "InterfaceItemAllocation": {
+          "source": "52060906-0000-4000-8000-000000000016",
+          "target": "52060906-0000-4000-8000-000000000014",
+          "order": 0,
+          "transmission": "Synchronous",
+          "acquisition": "Unspecified"
+        }
+      }
+    },
+    "52060906-0000-4000-8000-00000000001f": {
+      "id": "52060906-0000-4000-8000-00000000001f",
+      "alias": "operation_probe_31",
+      "name": "InterfaceItemAllocation 31",
+      "description": "",
+      "body": {
+        "InterfaceItemAllocation": {
+          "source": "52060906-0000-4000-8000-000000000016",
+          "target": "52060906-0000-4000-8000-000000000015",
+          "order": 0,
+          "transmission": "Synchronous",
+          "acquisition": "Unspecified"
+        }
+      }
+    },
+    "52060906-0000-4000-8000-000000000020": {
+      "id": "52060906-0000-4000-8000-000000000020",
+      "alias": "operation_probe_32",
+      "name": "InterfaceRequirement 32",
+      "description": "",
+      "body": {
+        "InterfaceRequirement": {
+          "source": "52060906-0000-4000-8000-00000000000c",
+          "target": "52060906-0000-4000-8000-000000000016"
+        }
+      }
+    },
+    "52060906-0000-4000-8000-000000000021": {
+      "id": "52060906-0000-4000-8000-000000000021",
+      "alias": "operation_probe_33",
+      "name": "InterfaceProvision 33",
+      "description": "",
+      "body": {
+        "InterfaceProvision": {
+          "source": "52060906-0000-4000-8000-00000000000d",
+          "target": "52060906-0000-4000-8000-000000000016"
+        }
+      }
+    },
+    "52060906-0000-4000-8000-000000000022": {
+      "id": "52060906-0000-4000-8000-000000000022",
+      "alias": "operation_probe_34",
+      "name": "BoundaryExchange 34",
+      "description": "",
+      "body": {
+        "BoundaryExchange": {
+          "source": "52060906-0000-4000-8000-00000000000c",
+          "target": "52060906-0000-4000-8000-00000000000d",
+          "oriented": false,
+          "items": [
+            "52060906-0000-4000-8000-000000000014",
+            "52060906-0000-4000-8000-000000000015"
+          ]
+        }
+      }
+    },
+    "661511e2-3604-5faf-9deb-f741925615bb": {
+      "id": "661511e2-3604-5faf-9deb-f741925615bb",
+      "alias": "sa_a_then_b",
+      "name": "a then b",
+      "description": "",
+      "body": {
+        "SequenceLink": {
+          "source": "14d1133a-697d-5b54-b624-eed0fb04a354",
+          "target": "bf9ba00e-2aaa-5f04-9ba1-2c242d07b938",
+          "guard": ""
+        }
+      }
+    },
+    "aedc3e72-fd4b-5dcd-b9c1-ced7aee3e0d1": {
+      "id": "aedc3e72-fd4b-5dcd-b9c1-ced7aee3e0d1",
+      "alias": "sa_b_then_c",
+      "name": "b then c",
+      "description": "",
+      "body": {
+        "SequenceLink": {
+          "source": "bf9ba00e-2aaa-5f04-9ba1-2c242d07b938",
+          "target": "1a215aed-f0b1-521d-b52f-0c1cfbbf1c36",
+          "guard": ""
+        }
+      }
+    }
+  },
+  "diagrams": {},
+  "artifact_links": {},
+  "traces": {}
+}
@@ -0,0 +1,477 @@
+arcadia 7;
+project source7_native_contract "Reusable procedures and operation identity" id "52060906-0000-4000-8000-000000000001" {
+    include "rationale.arcadia";
+    description "";
+
+    sa_function sa_work_a "A · Begin assessment" id "071edc32-5c27-5c1d-91ff-337c80b462d5" {
+        description "";
+        parent none;
+    }
+
+    oa_occurrence oa_x "X · Check authorization" id "08ff2083-dac1-5f4b-ad6a-7cc81d7be29d" {
+        body {
+            Action {
+                action @oa_work_x;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @oa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_occurrence sa_a "A · Begin assessment" id "14d1133a-697d-5b54-b624-eed0fb04a354" {
+        body {
+            Action {
+                action @sa_work_a;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @sa_procedure;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_occurrence sa_c "C · Finish assessment" id "1a215aed-f0b1-521d-b52f-0c1cfbbf1c36" {
+        body {
+            Action {
+                action @sa_work_c;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @sa_procedure;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_occurrence oa_r2 "Second assessment" id "1e27be58-3e3e-5869-ad30-e94a28ea2a2e" {
+        body {
+            SequenceReference {
+                sequence @oa_procedure;
+            };
+        };
+        description "";
+        parent @oa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_process oa_caller "Caller with three assessments" id "2100ac23-79ee-54e1-b3cf-69f3d4f3b30a" {
+        description "";
+        parent none;
+        steps [@oa_x, @oa_r1, @oa_r2, @oa_r3];
+    }
+
+    oa_activity oa_work_a "A · Begin assessment" id "25fdfe13-c45d-5822-830a-192ff13f660d" {
+        description "";
+        parent none;
+    }
+
+    oa_process oa_nested_definition "Nested assessment wrapper" id "273d8df8-83c8-5d75-99d1-59a7c9fdb705" {
+        description "";
+        parent none;
+        steps [@oa_inner];
+    }
+
+    sa_function sa_work_b "B · Review assessment" id "3360ccb1-68ac-51cd-8d9a-8893000c80ef" {
+        description "";
+        parent none;
+    }
+
+    oa_activity oa_work_c "C · Finish assessment" id "47335738-0876-5f90-b25e-1636c7448e93" {
+        description "";
+        parent none;
+    }
+
+    sa_occurrence sa_r3 "Nested assessment" id "4a65dad8-e2a1-51dc-87a0-02ea4ab69384" {
+        body {
+            SequenceReference {
+                sequence @sa_nested_definition;
+            };
+        };
+        description "";
+        parent @sa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_actor operation_probe_10 "Operator console" id "52060906-0000-4000-8000-00000000000a" {
+        description "";
+        parent none;
+    }
+
+    sa_system operation_probe_11 "Valve service" id "52060906-0000-4000-8000-00000000000b" {
+        description "";
+        parent none;
+    }
+
+    sa_port operation_probe_12 "Service socket" id "52060906-0000-4000-8000-00000000000c" {
+        contract {
+            Component {
+                kind Standard;
+                orientation Unset;
+            };
+        };
+        description "";
+        legacy none;
+        parent @operation_probe_10;
+    }
+
+    sa_port operation_probe_13 "Service socket" id "52060906-0000-4000-8000-00000000000d" {
+        contract {
+            Component {
+                kind Standard;
+                orientation Unset;
+            };
+        };
+        description "";
+        legacy none;
+        parent @operation_probe_11;
+    }
+
+    sa_exchange_item operation_probe_20 "Reset" id "52060906-0000-4000-8000-000000000014" {
+        description "";
+        kind Information;
+        mechanism Operation;
+        parent none;
+        supertype none;
+    }
+
+    sa_exchange_item operation_probe_21 "ReadStatus" id "52060906-0000-4000-8000-000000000015" {
+        description "";
+        kind Information;
+        mechanism Operation;
+        parent none;
+        supertype none;
+    }
+
+    sa_interface operation_probe_22 "Valve commands" id "52060906-0000-4000-8000-000000000016" {
+        description "";
+        parent none;
+        supertype none;
+    }
+
+    sa_scenario operation_probe_40 "Reset then read status" id "52060906-0000-4000-8000-000000000028" {
+        context none;
+        description "";
+        parent none;
+        postcondition "";
+        precondition "";
+        steps [@operation_probe_43, @operation_probe_44, @reset_reply];
+        viewpoint BoundaryInterface;
+    }
+
+    sa_lifeline operation_probe_41 "Service participant" id "52060906-0000-4000-8000-000000000029" {
+        description "";
+        parent @operation_probe_40;
+        represented @operation_probe_10;
+    }
+
+    sa_lifeline operation_probe_42 "Service participant" id "52060906-0000-4000-8000-00000000002a" {
+        description "";
+        parent @operation_probe_40;
+        represented @operation_probe_11;
+    }
+
+    sa_occurrence operation_probe_43 "Call Reset" id "52060906-0000-4000-8000-00000000002b" {
+        body {
+            Exchange {
+                exchange @operation_probe_34;
+                message_kind Call;
+                receiver @operation_probe_42;
+                reply_to none;
+                sender @operation_probe_41;
+                values [];
+            };
+        };
+        description "";
+        parent @operation_probe_40;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_occurrence operation_probe_44 "Call ReadStatus" id "52060906-0000-4000-8000-00000000002c" {
+        body {
+            Exchange {
+                exchange @operation_probe_34;
+                message_kind Call;
+                receiver @operation_probe_42;
+                reply_to none;
+                sender @operation_probe_41;
+                values [];
+            };
+        };
+        description "";
+        parent @operation_probe_40;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_occurrence sa_x "X · Check authorization" id "53ad2109-ba9d-5859-b258-64cdaab5c4a8" {
+        body {
+            Action {
+                action @sa_work_x;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @sa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_occurrence sa_r1 "First assessment" id "62cfdab1-a18b-5b06-8ee7-cd0b320e4024" {
+        body {
+            SequenceReference {
+                sequence @sa_procedure;
+            };
+        };
+        description "";
+        parent @sa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_function sa_work_c "C · Finish assessment" id "6575bce8-4185-519b-a004-d96650da63dc" {
+        description "";
+        parent none;
+    }
+
+    sa_functional_chain sa_nested_definition "Nested assessment wrapper" id "7932ab3a-6b60-5059-a3a0-fca3a2f9a197" {
+        description "";
+        parent none;
+        steps [@sa_inner];
+    }
+
+    sa_function sa_work_x "X · Check authorization" id "8c3d9b89-aa12-5218-9de9-12b8b5d4e4b3" {
+        description "";
+        parent none;
+    }
+
+    sa_occurrence sa_r2 "Second assessment" id "999b5e15-903f-5ca1-bc11-e51fadf80762" {
+        body {
+            SequenceReference {
+                sequence @sa_procedure;
+            };
+        };
+        description "";
+        parent @sa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_activity oa_work_b "B · Review assessment" id "a39639dc-0ece-5b71-981d-c9523fed4914" {
+        description "";
+        parent none;
+    }
+
+    sa_occurrence reset_reply "Correlated reset reply" id "aa8b674f-012f-583f-8dc7-a76407d1f8a7" {
+        body {
+            Exchange {
+                exchange @operation_probe_34;
+                message_kind Reply;
+                receiver @operation_probe_41;
+                reply_to @operation_probe_43;
+                sender @operation_probe_42;
+                values [];
+            };
+        };
+        description "";
+        parent @operation_probe_40;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_process oa_procedure "Reusable assessment A to C" id "af139b27-7e42-5729-9e49-53b2ac62c9e7" {
+        description "";
+        parent none;
+        steps [@oa_a, @oa_b, @oa_c];
+    }
+
+    sa_occurrence sa_b "B · Review assessment" id "bf9ba00e-2aaa-5f04-9ba1-2c242d07b938" {
+        body {
+            Action {
+                action @sa_work_b;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @sa_procedure;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_functional_chain sa_procedure "Reusable assessment A to C" id "c1d4eda2-fac7-5621-a7ac-25f985911bf5" {
+        description "";
+        parent none;
+        steps [@sa_a, @sa_b, @sa_c];
+    }
+
+    oa_occurrence oa_c "C · Finish assessment" id "c40c2011-4497-52f0-9e0e-10323b3150a8" {
+        body {
+            Action {
+                action @oa_work_c;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @oa_procedure;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_occurrence oa_r1 "First assessment" id "d48951ad-c6db-5eae-923a-edccab97155e" {
+        body {
+            SequenceReference {
+                sequence @oa_procedure;
+            };
+        };
+        description "";
+        parent @oa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_functional_chain sa_caller "Caller with three assessments" id "d4911fd0-52ed-535c-9f87-170e8f5731d2" {
+        description "";
+        parent none;
+        steps [@sa_x, @sa_r1, @sa_r2, @sa_r3];
+    }
+
+    oa_occurrence oa_a "A · Begin assessment" id "dc17769b-7e1e-5f15-99bb-0caf98bcb006" {
+        body {
+            Action {
+                action @oa_work_a;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @oa_procedure;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_occurrence oa_inner "Inner assessment" id "e16033cd-3184-56ef-b462-5559ad212c84" {
+        body {
+            SequenceReference {
+                sequence @oa_procedure;
+            };
+        };
+        description "";
+        parent @oa_nested_definition;
+        postcondition "";
+        precondition "";
+    }
+
+    sa_occurrence sa_inner "Inner assessment" id "e21febd2-30ec-5e9d-aa4c-3c54c95c2c9f" {
+        body {
+            SequenceReference {
+                sequence @sa_procedure;
+            };
+        };
+        description "";
+        parent @sa_nested_definition;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_activity oa_work_x "X · Check authorization" id "e78d841a-a37e-5106-8356-b1e3ce6d2501" {
+        description "";
+        parent none;
+    }
+
+    oa_occurrence oa_b "B · Review assessment" id "ef2a06af-6013-5f0b-a56d-db705f0685ce" {
+        body {
+            Action {
+                action @oa_work_b;
+                lifeline none;
+            };
+        };
+        description "";
+        parent @oa_procedure;
+        postcondition "";
+        precondition "";
+    }
+
+    oa_occurrence oa_r3 "Nested assessment" id "fc986c5c-eae7-5363-bcd5-b832d565a89a" {
+        body {
+            SequenceReference {
+                sequence @oa_nested_definition;
+            };
+        };
+        description "";
+        parent @oa_caller;
+        postcondition "";
+        precondition "";
+    }
+
+    sequence_link oa_a_then_b "a then b" id "0fc11ada-23a6-5f39-9891-e7f363a1edfb" {
+        description "";
+        guard "";
+        source @oa_a;
+        target @oa_b;
+    }
+
+    sequence_link oa_b_then_c "b then c" id "169f558e-a466-5fcc-b0d7-53e481952714" {
+        description "";
+        guard "";
+        source @oa_b;
+        target @oa_c;
+    }
+
+    interface_item_allocation operation_probe_30 "InterfaceItemAllocation 30" id "52060906-0000-4000-8000-00000000001e" {
+        acquisition Unspecified;
+        description "";
+        order 0;
+        source @operation_probe_22;
+        target @operation_probe_20;
+        transmission Synchronous;
+    }
+
+    interface_item_allocation operation_probe_31 "InterfaceItemAllocation 31" id "52060906-0000-4000-8000-00000000001f" {
+        acquisition Unspecified;
+        description "";
+        order 0;
+        source @operation_probe_22;
+        target @operation_probe_21;
+        transmission Synchronous;
+    }
+
+    interface_requirement operation_probe_32 "InterfaceRequirement 32" id "52060906-0000-4000-8000-000000000020" {
+        description "";
+        source @operation_probe_12;
+        target @operation_probe_22;
+    }
+
+    interface_provision operation_probe_33 "InterfaceProvision 33" id "52060906-0000-4000-8000-000000000021" {
+        description "";
+        source @operation_probe_13;
+        target @operation_probe_22;
+    }
+
+    boundary_exchange operation_probe_34 "BoundaryExchange 34" id "52060906-0000-4000-8000-000000000022" {
+        description "";
+        items [@operation_probe_20, @operation_probe_21];
+        oriented false;
+        source @operation_probe_12;
+        target @operation_probe_13;
+    }
+
+    sequence_link sa_a_then_b "a then b" id "661511e2-3604-5faf-9deb-f741925615bb" {
+        description "";
+        guard "";
+        source @sa_a;
+        target @sa_b;
+    }
+
+    sequence_link sa_b_then_c "b then c" id "aedc3e72-fd4b-5dcd-b9c1-ced7aee3e0d1" {
+        description "";
+        guard "";
+        source @sa_b;
+        target @sa_c;
+    }
+
+}
@@ -0,0 +1 @@
+// Native oracle: retain this authored 雨 note and CRLF.
@@ -0,0 +1,14 @@
+{
+  "expected-baseline.json": {
+    "bytes": 26428,
+    "sha256": "e2882a58f841f460f45d9d67db1606440e0d7997b9b29a784569ae48e4b23bfb"
+  },
+  "project.arcadia": {
+    "bytes": 13616,
+    "sha256": "5474d8ca05fd1375220dc0ad40d913631fde51159e9632bb9f290d1ecdab8dd7"
+  },
+  "rationale.arcadia": {
+    "bytes": 59,
+    "sha256": "e6a600e13036d4ad594a65380ed1b3d82d1772d583041bb0a624c9588a73047a"
+  }
+}
				`@@ -0,0 +1 @@`
				`// Preserve this included engineering note: rescue 雨.`
				`@@ -0,0 +1 @@`
				`// Native oracle: retain this authored 雨 note and CRLF.`