[codex] Fix stale issue execution run locks (#4258)

## Thinking Path

> - Paperclip is a control plane for AI-agent companies, so issue
checkout and execution ownership are core safety contracts.
> - The affected subsystem is the issue service and route layer that
gates agent writes by `checkoutRunId` and `executionRunId`.
> - PAP-1982 exposed a stale-lock failure mode where a terminal
heartbeat run could leave `executionRunId` pinned after checkout
ownership had moved or been cleared.
> - That stale execution lock could reject legitimate
PATCH/comment/release requests from the rightful assignee after a
harness restart.
> - This pull request centralizes terminal-run cleanup, applies it
before ownership-gated writes, and adds a board-only recovery endpoint
for operator intervention.
> - The benefit is that crashed or terminal runs no longer strand issues
behind stale execution locks, while live execution locks still block
conflicting writes.

## What Changed

- Added `issueService.clearExecutionRunIfTerminal()` to atomically lock
the issue/run rows and clear terminal or missing execution-run locks.
- Reused stale execution-lock cleanup from checkout,
`assertCheckoutOwner()`, and `release()`.
- Allowed the same assigned agent/current run to adopt an unowned
`in_progress` checkout after stale execution-lock cleanup.
- Updated release to clear `executionRunId`, `executionAgentNameKey`,
and `executionLockedAt`.
- Added board-only `POST /api/issues/:id/admin/force-release` with
company access checks, optional `clearAssignee=true`, and
`issue.admin_force_release` audit logging.
- Added embedded Postgres service tests and route integration tests for
stale-lock recovery, release behavior, and admin force-release
authorization/audit behavior.
- Documented the new force-release API in `doc/SPEC-implementation.md`.

## Verification

- `pnpm vitest run server/src/__tests__/issues-service.test.ts
server/src/__tests__/issue-stale-execution-lock-routes.test.ts` passed.
- `pnpm vitest run
server/src/__tests__/issue-stale-execution-lock-routes.test.ts
server/src/__tests__/approval-routes-idempotency.test.ts
server/src/__tests__/issue-comment-reopen-routes.test.ts
server/src/__tests__/issue-telemetry-routes.test.ts` passed.
- `pnpm -r typecheck` passed.
- `pnpm build` passed.
- `git diff --check` passed.
- `pnpm lint` could not run because this repo has no `lint` command.
- Full `pnpm test:run` completed with 4 failures in existing route
suites: `approval-routes-idempotency.test.ts` (2),
`issue-comment-reopen-routes.test.ts` (1), and
`issue-telemetry-routes.test.ts` (1). Those same files pass when run
isolated and when run together with the new stale-lock route test, so
this appears to be a whole-suite ordering/mock-isolation issue outside
this patch path.

## Risks

- Medium: this changes ownership-gated write behavior. The new adoption
path is limited to the current run, the current assignee, `in_progress`
issues, and rows with no checkout owner after terminal-lock cleanup.
- Low: the admin force-release endpoint is board-only and
company-scoped, but misuse can intentionally clear a live lock. It
writes an audit event with prior lock IDs.
- No schema or migration changes.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex, GPT-5 coding agent (`gpt-5`), agentic coding with
terminal/tool use and local test execution.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

doc/SPEC-implementation.md

@@ -484,6 +484,7 @@ All endpoints are under `/api` and return JSON.
 - `DELETE /issues/:issueId/documents/:key`
 - `POST /issues/:issueId/checkout`
 - `POST /issues/:issueId/release`
+- `POST /issues/:issueId/admin/force-release` (board-only lock recovery)
 - `POST /issues/:issueId/comments`
 - `GET /issues/:issueId/comments`
 - `POST /companies/:companyId/issues/:issueId/attachments` (multipart upload)
@@ -508,6 +509,8 @@ Server behavior:
 2. if updated row count is 0, return `409` with current owner/status
 3. successful checkout sets `assignee_agent_id`, `status = in_progress`, and `started_at`
 
+`POST /issues/:issueId/admin/force-release` is an operator recovery endpoint for stale harness locks. It requires board access to the issue company, clears checkout and execution run lock fields, and may clear the agent assignee when `clearAssignee=true` is passed. The route must write an `issue.admin_force_release` activity log entry containing the previous checkout and execution run IDs.
+
 ## 10.5 Projects
 
 - `GET /companies/:companyId/projects`