Remove legacy import/export paths and duplicate handlers to stabilize Workspace V2 runtime - PR_11_310

Author: DavidQ

docs/dev/codex_commands.md

@@ -92,3 +92,11 @@ After validation, Codex must create:
 ```
 
 The ZIP must preserve repo-relative structure and include the final changed files plus docs/dev evidence.
+
+
+---
+PR_11_310
+
+```bash
+npx @openai/codex run --model gpt-5.3-codex --reasoning medium "Implement PR_11_310 ..."
+```

docs/dev/commit_comment.txt

@@ -1 +1 @@
-Complete Tilemap Studio V2 with HTML-first shell and session-only behavior - PR 11.198
+Remove Workspace V2 legacy diagnostics and duplicate session handlers; enforce single import/export/session activation paths - PR 11.310

docs/dev/reports/PR_11_310_report.md

@@ -0,0 +1,26 @@
+# PR_11_310 Report - Workspace V2 Legacy/Conflicting Logic Cleanup
+
+## Files Changed
+- `tools/workspace-v2/index.js`
+- `docs/pr/PR_11_310_WORKSPACE_V2_STATE_CLEANUP/PLAN_PR.md`
+- `docs/pr/PR_11_310_WORKSPACE_V2_STATE_CLEANUP/BUILD_PR.md`
+- `docs/dev/codex_commands.md`
+- `docs/dev/commit_comment.txt`
+- `docs/dev/reports/PR_11_310_report.md`
+
+## Summary
+- Removed diagnostics panel runtime logic and its event wiring.
+- Removed dead import/export handlers (`importSessionJson`, `exportCurrentSessionJson`) to keep one import path and one export path.
+- Consolidated active session writes through a single activation method (`activateWorkspaceSession`).
+- Removed legacy unused nav-mode helper methods.
+- Kept workspace import/export centered on `tools.*` structure and retained existing schema/data shapes.
+
+## Validation Commands
+- `node --check tools/workspace-v2/index.js`
+
+## Validation Results
+- PASS: syntax check succeeded.
+
+## Full Samples Smoke
+- Skipped.
+- Reason: change is isolated to Workspace V2 UI/controller logic in one file and does not touch shared sample infrastructure.

docs/pr/PR_11_310_WORKSPACE_V2_STATE_CLEANUP/BUILD_PR.md

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+# BUILD_PR_11_310
+
+## Implementation
+- Removed diagnostics panel logic and runtime hooks from Workspace V2.
+- Removed dead `importSessionJson` and `exportCurrentSessionJson` code paths.
+- Added `activateWorkspaceSession(...)` and routed active import/export/session flows through this single activation path.
+- Removed legacy nav-mode helper methods that were no longer used.
+
+## Constraints Followed
+- No schema contract changes
+- No runtime data shape changes
+- No new features
+- Palette ownership logic left intact
+
+## Validation
+- `node --check tools/workspace-v2/index.js`

docs/pr/PR_11_310_WORKSPACE_V2_STATE_CLEANUP/PLAN_PR.md

@@ -0,0 +1,17 @@
+# PLAN_PR_11_310
+
+## Purpose
+Remove conflicting and legacy Workspace V2 state paths so import/export/session activation each use one active flow.
+
+## Scope
+- `tools/workspace-v2/index.js`
+- Remove dead import/export code paths
+- Remove diagnostics panel UI + logic
+- Consolidate session activation path
+
+## Steps
+1. Remove diagnostics bindings/logic and panel render path.
+2. Remove dead tool-mode import/export handlers.
+3. Consolidate session activation through one helper path.
+4. Verify no legacy workspace shape references remain in runtime logic.
+5. Run targeted syntax validation and package artifacts.