Task: Finalize latest main integration

Identity

Treat verified integration checkpoint cdbc262 as the immutable base after all source merges and canonical reconciliation are already present.
Re-run the task-aware project-document gate from that post-merge base, verify origin/main has not advanced, fast-forward local main, and push normally to origin/main.

Do not change source-task records, product behavior, or accepted product decisions in this final gate.
Do not rewrite remote history or force-push. Abort promotion if remote ancestry changes or local main cannot fast-forward cleanly.
Keep retired OpenMAIC Learning Player source b1f51be excluded under ADR-005.
Release integration ownership only after the final worktree is clean.

The final-gate task was claimed at clean post-merge checkpoint cdbc262, so source task records are part of its immutable base and remain read-only under the project-doc ownership check.
A fresh fetch confirmed origin/main remains at 28e1690; the verified checkpoint contains all remote commits and is 42 commits ahead / 0 behind.
Local branch audit again found only codex/learning-player-release-fix outside the integrated ancestry; that branch remains deliberately excluded by ADR-005.
Local main fast-forwarded cleanly from 5d7a235 to e1fddee. A normal, non-force push advanced origin/main from 28e1690 to e1fddee; the subsequent fetch confirmed local main, the integration branch, and origin/main all resolve to e1fddeea158a6273fbdfe894aae2c239b13b9dd9.

Inherited verified checkpoint results from task 20260903-integrate-latest-6f2c8e1a: focused Vitest 5 files / 70 tests; Electron pi-coding-first-chat 4/4; full Vitest 223 files / 1,832 passed / 3 skipped plus pressure 1/1; typecheck; lint with 0 errors / 5 existing warnings; Renderer/Main/Preload/utility production build; git diff --check.
Fresh git fetch origin --prune: passed; origin/main remains 28e1690.
git rev-list --left-right --count origin/main...cdbc262: 0 42.
git merge --ff-only codex/20260903-integrate-latest-6f2c8e1a-integrate-latest in the main worktree: passed.
git push origin main: passed, 28e1690..e1fddee main -> main.
Post-push git fetch origin --prune and ref comparison: local main, integration branch, and origin/main all equal e1fddee; main worktree clean.