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.

harness/PLAN.md

@@ -1,5 +1,9 @@
 # First release execution plan
 
+**Latest refinement:** consult actual installed Capella 7.1, replace the user-rejected horizontal creation/connection rows with a compact contextual palette and inline authoring, independently critique interaction risks, then build and verify the real workflow at wide/minimum sizes. [Benchmark and concrete acceptance](release-capella-basic-editing-20260907.md). Do not ship the rejected toolbar as the usability correction.
+
+**Current priority (7 September):** the user's usability correction takes precedence over the advanced feature sequence below. Establish contextual named diagram creation, existing-element placement, basic editing and clear layer transitions, then verify them natively. Desktop checks were explicitly reauthorized. See [priority reset and acceptance](release-basic-editing-reset-20260907.md).
+
 ## Outcome and baseline
 
 Deliver the first release of Arcadia Studio for system engineers: complete Operational Analysis and System Analysis/System Architecture workflows, equivalent graphical and textual models, clear artifact traceability and a deployable/programmatically accessible Rust service. Logical/Physical Architecture and later Arcadia layers are future releases, as the new objective explicitly states.
@@ -71,20 +75,26 @@ Tests must cover user-visible meaning and cross-representation invariants, not j
 
 Every concrete requirement in the new objective and release coverage table has authoritative current evidence. Primary OA/SA engineering workflows work graphically, textually and through the API; help is navigable and useful; native Windows/Linux UI is intentionally designed and exercised; no blocking/high-impact defect remains; strict checks pass; independent findings are closed; durable docs accurately reflect the release; another engineer can build/run/test and use the supplied packages. V2 completion alone does not satisfy this goal.
 
-## Current milestone progress — hosted integration
+## Historical milestone progress — hosted integration
 
 Milestone4 desktop adapter is implemented on the existing Document/REST boundary.
 Windows native publish, graphical/text save, rejected invalid source, API artifact
 reload and stale-revision recovery are demonstrated. Offline/retry and exact local-copy/catalog Open native acceptance passed on Windows.
-Destination and catalog defects found afterward are fixed/reviewed/integrated;
-recheck those and Linux native next. Constructor groups and reset/unordered keyed
-GUI are integrated/reviewed. Annotation/Binding and Home/recents are active; order,
-attachments, artifacts, multi-source GUI and checkpoint recovery remain required.
+Destination and catalog defects found afterward were fixed/reviewed/integrated; remaining platform/native cases retain their report scope. Constructor/keyed/order/Child/Incident/artifact and multi-source review, Home/recents and checkpoint recovery are now implemented. Their scoped native and automated results are in STATE.md; this older milestone is not a current absence list.
 
-## Current execution refinement — 2026-09-06
+## Current execution refinement — 2026-09-07
 
-First-release scope above is unchanged. Current work integrates source6 participant communication, typed saved views and batch semantic review. Run the integrated desktop test build and decisive compatibility/recovery/convergence/projection tests first. Then evaluate actual new native workflows and exact source/REST oracles. Add presentation duplication through existing CreateDiagram; test the deterministic forty-same-pair exchange fixture and implement explicit presentation grouping only if its readability/identity-access gate fails. Remaining child/incident/artifact review controls and full platform/package/end-state gates follow. Current evidence and process ownership are in the top section of STATE.md; historical statuses below do not describe current running binaries.
+First-release scope above is unchanged. The user-requested Windows development preview is packaged with565files, including all37 teaching-folder files, and is linked from `DEVELOPMENT_SUMMARY.md`. Latest Fit6 and two existing scroll/branch regressions pass; full desktop570/570, workspace bins, formatting and strict workspace/all-target Clippy pass. Corrected full server56/56 retains its unchanged-server scope. Exact build status and provenance are recorded in STATE.md. This is not an optimized final release.
 
-The later source6 checkpoint has native artifact/batch/attachment/communication/view/history evidence and corrected behavior-transition navigation. Teaching onboarding and reviewed-name source/history/reopen pass; a separate semantic-review view mismatch is corrected and under rebuilt native verification. Linux server build and actual HTTP/restart pass on an immutable older lesson snapshot; full desktop/package acceptance remains required.
+Native6BAB operation/recovery/history passes and BCC1 corrected OA/SA nested routing passes retain their separate binary scopes. The latest DC50 preview launched with a clean PATH, and its four-card OA Fit overview was visible at1444×932 and1102×932. Minimum-height, pending-form and remaining process-purpose acceptance are still open. Computer Use was stopped by the user's Escape; leave both live GUI processes untouched and continue independent work.
 
-Scope reconciliation established two remaining semantic gaps through executable counterexamples: S1 contextual links into repeated/nested reusable processes and S2 explicit interface-operation selection in parameterless scenarios. Complete their jointly reviewed source7 contract before implementation: one core owner coordinates DTO/resolver/validation/reference lifecycle/source/version/transition/facets; separate desktop and recovery owners consume those shared semantics after the core checkpoint. Preserve old5/6 byte and checkpoint contracts, typed graphical/source/REST parity, caller-specific diagnostics and real instance-isolation/lifecycle oracles. Improve the cramped process working space and explicit reference navigation alongside contextual rendering. These are release work, not optional later-layer features. Independent critiques and proposed analysis rules are linked from STATE.md.
+Native Linux core436passed/2ignored is complete on its frozen455-file snapshot. The original server compile passed, unit2/2 and HTTP50/51 passed, and the single504-versus412 timing fixture failed twice. Its private preparation-gate replacement passes on Windows but still requires Linux execution. Preserve the original failures and exact final-state assertions; do not alter the production30-second deadline to make the fixture pass.
+
+The fresh Linux GUI cross-build passed on immutable458-file snapshot `source7-20260907T102528493108Z`, including the Fit constructor fix. Run `20260907T1025486926611Z` completed in2m20s Cargo time with pre/post checks, ELF requirements and all37 lesson files verified; the compiler lease is released. The subsequent headless guest failed its early IO-APIC timer check on three bounded boots, before SSH/tests. Exact matching boot assets were extracted, but automatic approval review rejected the proposed transient boot workaround before launch. All task VMs are stopped; no application failure or current Linux server pass is inferred. Latest guide-label changes and the validated Exchange/CommonWork native oracles follow the frozen binary snapshot.
+
+Next actions:
+
+1. Retain all three guest boot records and exact-kernel proof; the proposed direct-boot action was denied by automatic approval review and must not be retried or split to bypass it. Resolve the runtime gate through an approved route or changed environment. Verify actual readiness and remaining monotonic budget before running the corrected Linux server gate. Do not restart on observation timeout alone.
+2. Preserve the reviewed guide corrections and validated expected-model/source Exchange/CommonWork oracles; the updated guide now builds on Windows and belongs in the next packaged/native snapshot. Complete native purpose authoring/history once control is available.
+3. Once native control is authorized again, complete current-layout minimum-height/Focus/pending-form checks, remaining engineering/hosted walkthroughs and actual Linux GUI acceptance using exact model/source/history evidence.
+4. Execute the corrected Linux server suite; complete final Windows/Linux optimized builds, package provenance, documentation/contracts, and fresh independent cross-disciplinary end-state review. Successful slices do not complete the goal.