diff --git a/harness/experiments/capella-scenario-observations-20260913/.gitattributes b/harness/experiments/capella-scenario-observations-20260913/.gitattributes
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+++ b/harness/experiments/capella-scenario-observations-20260913/.gitattributes
@@ -0,0 +1 @@
+* -text -whitespace
diff --git a/harness/experiments/capella-scenario-observations-20260913/README.md b/harness/experiments/capella-scenario-observations-20260913/README.md
new file mode 100644
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+++ b/harness/experiments/capella-scenario-observations-20260913/README.md
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+# Native Capella Scenario spacing observation
+
+A bounded primary observation in Capella **7.1.0.202606231255** on Windows, using isolated workspace capella-layout-benchmark-20260912 and project IncidentScenarioBenchmark. The parent integration session performed the authorized Computer/Sky interactions and reports closing Capella normally afterward. This archive's independent reviewer inspected the saved screenshots and files; the reviewer did not perform native input. [observations.json](original/observations.json) retains the operator's actions, timestamps and capture recovery notes.
+
+Scope: one Operational Analysis scenario, two activity lifelines and one interaction. This does not establish chronology-crossing/reordering behavior, activation nesting, or a general Capella gesture policy.
+
+## Observed workflow
+
+| Evidence | Observed result |
+| --- | --- |
+| [01 empty scenario](original/01-empty-scenario.jpg), [02 lifeline](original/02-created-lifeline.jpg), [03 interaction choice](original/03-interaction-choice.jpg), [04 message](original/04-created-message.jpg) | Created two activity lifelines and one Report incident interaction. Completing the pending interaction used an endpoint click and the Create a new Interaction choice. |
+| [05 body drag](original/05-body-drag-no-visible-change.jpg), [06 selected body drag](original/06-selected-body-drag-no-visible-change.jpg) | Two arrow-body drag attempts produced no visible movement, including the attempt after selecting Sequence Message. This does not prove that Capella never supports body movement. |
+| [07 receiver execution drag](original/07-execution-drag-moves-message.jpg) | Dragging the small receiver execution down 79 pixels moved the whole horizontal message from screen y334 to y413, with its receiver execution. |
+| [08 lifeline header drag](original/08-lifeline-header-drag.jpg) | Moving the left header from screen x430 to x510 moved that lifeline and its attached message endpoint 80 pixels. |
+| [09 first Undo](original/09-undo-lifeline.jpg) | One Undo restored the left lifeline to x430 while the message remained at y413. |
+| [10 second Undo](original/10-undo-message.jpg) | The next Undo restored the message to y334. After Save, both captured files exactly matched the baseline. |
+
+The operator recorded two capture timeouts: after the first activity placement and after the initial interaction drag. Each was recovered by selecting the returned window afresh and taking another screenshot; the input was not repeated. These failures/recoveries are preserved in observations.json rather than omitted or treated as extra interactions.
+
+## Saved-file comparison
+
+[Before .capella](original/before-drag-IncidentScenarioBenchmark.capella), [after receiver-drag .capella](original/after-drag-IncidentScenarioBenchmark.capella), and [restored .capella](original/restored-IncidentScenarioBenchmark.capella) are byte-identical: 26,594 bytes, SHA-256 d8764060c6f3d11ddf24a91e20955fe035725cfe35019fdd514688d07118c056. Thus this saved move did not alter the captured semantic model file.
+
+The [before .aird](original/before-drag-IncidentScenarioBenchmark.aird) and [after receiver-drag .aird](original/after-drag-IncidentScenarioBenchmark.aird) differ on exactly five lines, with no line insertion/deletion:
+
+| Before-file line | Field change | Interpretation |
+| --- | --- | --- |
+| 11 | representation changeId changed | Presentation revision metadata. |
+| 100 | receiver execution notation bounds y53→132 | +79 vertical placement; width/height unchanged. |
+| 125 | message relative bendpoint y offsets 0→79 | Both ends of the existing horizontal path moved vertically. |
+| 183 | receiver execution absolute-bounds y153→232 | +79 corresponding presentation filter. |
+| 205 | SequenceMessage absolute-bounds y153→232 | +79 corresponding message filter. |
+
+Object references identify the changed execution and Report incident SequenceMessage; [manifest.json](manifest.json) preserves the exact five before/after lines. This is a presentation-file change for the recorded receiver-execution move. No separate saved snapshot was taken after the horizontal header move, so its isolated serialized delta is not claimed.
+
+After both Undos and Save, [restored .aird](original/restored-IncidentScenarioBenchmark.aird) equals before byte-for-byte: 29,469 bytes, SHA-256 c24db589f3a551b8ea0f8d00d2dc6729909157e2a3ac4ebc0ca69cd141393c89. The two separate visible Undo steps and complete saved restoration support the observed local history behavior.
+
+## Integrity and implication
+
+All 27 original evidence artifacts are preserved without content changes: ten screenshots, their ten metadata files, observations and six source snapshots. The screenshots were originally named .png but contain JPEG/JFIF bytes. Published names use .jpg with explicit originalName→path mapping in manifest.json; no transcoding or duplicate image copies occurred. All ten metadata SHA-256 values and encoded 1010×761 dimensions were independently verified. The manifest includes every artifact's byte length, SHA-256 and Git blob SHA-1; local -text attributes preserve source line endings.
+
+This evidence supports separating view-local message/lifeline spacing from shared semantics for this simple case. A Studio gesture should make its target discoverable and separately verify preview/commit equality and one-step Undo. Those are design implications, not Capella-wide behavior or Studio implementation acceptance. The archive is observation evidence, not a packaged benchmark project or native Studio test.
diff --git a/harness/experiments/capella-scenario-observations-20260913/manifest.json b/harness/experiments/capella-scenario-observations-20260913/manifest.json
new file mode 100644
index 00000000..546d9e9a
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/manifest.json
@@ -0,0 +1,325 @@
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+  "archivedAtUtc": "2026-09-13T07:37:51.328Z",
+  "operator": "Parent integration session using authorized native Computer/Sky input",
+  "verifier": "Independent delegated file/screenshot review; no native input by verifier",
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diff --git a/harness/experiments/capella-scenario-observations-20260913/original/after-drag-IncidentScenarioBenchmark.capella b/harness/experiments/capella-scenario-observations-20260913/original/after-drag-IncidentScenarioBenchmark.capella
new file mode 100644
index 00000000..89742098
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/original/after-drag-IncidentScenarioBenchmark.capella
@@ -0,0 +1,320 @@
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diff --git a/harness/experiments/capella-scenario-observations-20260913/original/before-drag-IncidentScenarioBenchmark.aird b/harness/experiments/capella-scenario-observations-20260913/original/before-drag-IncidentScenarioBenchmark.aird
new file mode 100644
index 00000000..ccb8624f
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/original/before-drag-IncidentScenarioBenchmark.aird
@@ -0,0 +1,218 @@
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diff --git a/harness/experiments/capella-scenario-observations-20260913/original/before-drag-IncidentScenarioBenchmark.capella b/harness/experiments/capella-scenario-observations-20260913/original/before-drag-IncidentScenarioBenchmark.capella
new file mode 100644
index 00000000..89742098
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/original/before-drag-IncidentScenarioBenchmark.capella
@@ -0,0 +1,320 @@
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diff --git a/harness/experiments/capella-scenario-observations-20260913/original/observations.json b/harness/experiments/capella-scenario-observations-20260913/original/observations.json
new file mode 100644
index 00000000..5423e3e3
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/original/observations.json
@@ -0,0 +1,76 @@
+{
+  "date": "2026-09-13T07:34:22.962Z",
+  "app": "Capella7.1.0.202606231255",
+  "workspace": "capella-layout-benchmark-20260912",
+  "project": "IncidentScenarioBenchmark",
+  "scope": "Native Windows single OA scenario, two newly created activity lifelines, one interaction; no crossing/reorder or activation-nesting claim.",
+  "actions": [
+    {
+      "action": "Welcome New Capella Project, name IncidentScenarioBenchmark, Finish; close Welcome; Operational Analysis; Define Operational Activities and describe Interactions; Create OAS; accept default scenario name",
+      "result": "New blank OAS canvas with Activity/Activities/Interaction/Interaction with return branch/Reference/LOOP palette."
+    },
+    {
+      "action": "Activity then canvas381,205; Activity then canvas654,249",
+      "result": "Two created activity headers at x430 and703; properties visible."
+    },
+    {
+      "action": "Interaction then drag430,334 to703,334",
+      "result": "Pending line; drag did not finish creation."
+    },
+    {
+      "action": "Click703,334, choose Create a new Interaction, type Report incident, OK",
+      "result": "Horizontal message y334 with small receiver execution; Save baseline captured."
+    },
+    {
+      "action": "Select tool then arrow body drag500,334 to500,415",
+      "result": "No visible movement; repeat after selecting Sequence Message also no visible movement."
+    },
+    {
+      "action": "Receiver execution drag704,349 to704,428",
+      "result": "Whole message moved y334 to413, receiver execution moved with it; saved semantic .capella byte-for-byte unchanged, .aird changed."
+    },
+    {
+      "action": "Header drag430,256 to510,256",
+      "result": "Left lifeline moved80pixels and attached message endpoint moved."
+    },
+    {
+      "action": "Ctrl+Z once",
+      "result": "Left lifeline returned to430; message still413."
+    },
+    {
+      "action": "Ctrl+Z again",
+      "result": "Message returned334."
+    },
+    {
+      "action": "Ctrl+S",
+      "result": "Restored saved files captured."
+    }
+  ],
+  "captureFailures": [
+    {
+      "action": "first activity placement",
+      "error": "window capture timed out: timed out waiting on channel",
+      "recovery": "fresh returned window selection and screenshot succeeded; no repeat input"
+    },
+    {
+      "action": "interaction initial drag",
+      "error": "window capture timed out: timed out waiting on channel",
+      "recovery": "fresh returned window selection and screenshot succeeded; no repeat drag"
+    }
+  ],
+  "restored": [
+    {
+      "file": "IncidentScenarioBenchmark.capella",
+      "bytes": 26594,
+      "equalBefore": true,
+      "sha256": "d8764060c6f3d11ddf24a91e20955fe035725cfe35019fdd514688d07118c056"
+    },
+    {
+      "file": "IncidentScenarioBenchmark.aird",
+      "bytes": 29469,
+      "equalBefore": true,
+      "sha256": "c24db589f3a551b8ea0f8d00d2dc6729909157e2a3ac4ebc0ca69cd141393c89"
+    }
+  ],
+  "implication": "Evidence supports view-local message/lane spacing distinct from shared semantics. Body-drag failure is observed for this sequence; it does not prove Capella never supports message-body movement. Studio should make the target discoverable, retain exact one-Undo behavior, and verify preview/commit equality separately."
+}
\ No newline at end of file
diff --git a/harness/experiments/capella-scenario-observations-20260913/original/restored-IncidentScenarioBenchmark.aird b/harness/experiments/capella-scenario-observations-20260913/original/restored-IncidentScenarioBenchmark.aird
new file mode 100644
index 00000000..ccb8624f
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/original/restored-IncidentScenarioBenchmark.aird
@@ -0,0 +1,218 @@
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diff --git a/harness/experiments/capella-scenario-observations-20260913/original/restored-IncidentScenarioBenchmark.capella b/harness/experiments/capella-scenario-observations-20260913/original/restored-IncidentScenarioBenchmark.capella
new file mode 100644
index 00000000..89742098
--- /dev/null
+++ b/harness/experiments/capella-scenario-observations-20260913/original/restored-IncidentScenarioBenchmark.capella
@@ -0,0 +1,320 @@
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