feat: preserve nested source projects across desktop and REST

harness/TASK_LEDGER.md

@@ -16,6 +16,10 @@ System engineers can develop a coherent OA→SA system model, including iterativ
 
 ## Verified facts
 
+- Native modular source editing/reopen/repair/recovery passed on Windows at 1100×700. Production nested ownership, structural writeback and coupled REST source bundles now pass an initial 416-test workspace run. Actual service import/comment-only revision/cross-file move/stale ETag passed. Comment fidelity needs independent checks: review exposed owner-opening-line comment reassignment; root reproduced it and all 12 updater tests pass after the fix. Equal-model delete/recreate provenance was also reproduced and fixed in desktop and REST. Native nested workflow and final integrated review/checks remain.
+
+- Explorer/port usability accepted at `d364d3c`: actual Windows Actor → Standard port → Boundary Exchange, save/reopen and Undo/Redo; contextual duplicate-name search, 251-root paging, 12-level ancestry and 1100×700 inspection. Linux port save/reopen and font-dependent outline wrapping correction were verified. Exact evidence: release-explorer-usability.md. This resolves the latest discovery/navigation complaint without claiming broader release completeness.
+
 - Native Capella SAB authoring creates function input/output endpoints with an FE. Component ports separately carry Standard/Flow kind, orientation, interface roles and explicit allocated function ports. Details and successfully performed versus merely observed operations are in release-capella-workflow-benchmark.md.
 - Studio uses one typed Project and validated atomic commands across Rust core/desktop/server. Hierarchy projection distinguishes actual allocation from inferred parent summaries; IDs and placement are separate.
 - Drag selection bug fixed and committed `2ef16dc`; 71 desktop tests and real moved-card selection/property editing passed before typed-port integration.
@@ -23,7 +27,7 @@ System engineers can develop a coherent OA→SA system model, including iterativ
 - Independent core review reproduced alias reservation and same-transaction allocation replacement defects; fixes have focused regression evidence. Typed desktop integration `fa096ce` passed full checks and native creation/generation, undo/redo, save/reopen and no-op synchronization trials. Long-reference previews were inspected at 1440×900 and 1100×700; detailed evidence is in STATE.md.
 - Per-diagram pins and labels, source/API parity and shared orthogonal routing are implemented in `4e5a88d`, `a7c6f96`, `68b1eff` and `30c7db1`. `65fa9ab` resolves all six reproduced default SA label-overlap pairs. Native OA/SA editing, movement/undo, fold restoration, save/reopen, SVG inspection and short gestures at 1100×700 passed. Routing code/native acceptance and independent native follow-up are complete at `23535b4`; exact scope is recorded in release-routing-verification.md.
 - The source experiment passed 23 tests, but an independent probe reproduced positional item-comment misattachment, shorthand description rejection and unsupported deletion. Whole-model equality does not establish source-comment fidelity. The production updater retained comment attachment on the same reorder probe; extend its parser/updater instead of copying the experimental parallel implementation.
-- Current behavior diagrams derive geometry and only handle selection; direct behavior editing remains a product gap. The integrated source editor now retains modular accepted source instead of flattening it, with223core/121desktop/22server Windows tests passing; native acceptance and production nesting/shorthand remain incomplete.
+- Current behavior diagrams derive geometry and only handle selection; direct behavior editing remains a product gap. The source editor retains modular accepted source; nested element syntax is implemented and under native acceptance. Port/exchange/steps shorthand remains an independent future implementation slice required by the current authoring strategy.
 - Independent source review exposed declaration/comment reassignment during UUID changes and swaps, Linux FIFO hangs during disk admission, file-mode changes on save, and overlong detached-file receipt lifetimes. Command provenance, pre-open regular-file admission, permission retention and saved-detach receipt retirement resolve the reproduced cases. Exact probes and test scopes are in STATE.md.
 
 ## Assumptions to test
@@ -35,7 +39,7 @@ System engineers can develop a coherent OA→SA system model, including iterativ
 
 ## Open questions
 
-- Which selected nesting/shorthand constructs justify production parser/updater extension while preserving comment attachment, exact source Undo, complete editing and clear diagnostics? The independent source probe provides concrete acceptance cases.
+- Which port/exchange/steps shorthand constructs add enough clarity to justify extending the accepted nested ownership syntax? Preserve comment attachment, exact source Undo and complete edit/delete support against the independent probe cases.
 - What remaining OA/SA gaps materially block target workflows? R3 semantic reconciliation, R6 data contracts, directly editable behavior, lifecycle/recovery and hosted editing remain in the release plan.
 
 ## Candidate designs and current decisions