fix(code-review): disable code review when model not allowed

[alex-alecu]

Summary

Followup to #3558

• Disable Code Reviewer when a review fails because setup needs owner action, including when the selected model is not available for cloud agent sessions.
• Notify owners once per reason, show a settings alert, mark the current review as action required, and block retries until settings are fixed and Code Reviewer is enabled again.
• Treat these failures as expected owner-action cases in reporting and alerting instead of system spikes.

Verification

1. Trigger a Code Reviewer run where the selected model is not available for cloud agent sessions.
2. Confirm the review ends as action required and the check run says the selected model is unavailable.
3. Confirm Code Reviewer is disabled, the settings page shows an alert, and retry is blocked until Code Reviewer is enabled again.

Visual Changes

N/A

Reviewer Notes

No DB migration is needed because terminal reasons are stored as text. Keep the terminal reason allowlists in sync if this set changes again.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Incremental merge commit resolves conflicts and propagates selected_model_unavailable through all layers (type definitions, SQL expressions, classifier, shared copy, recovery routing) — consistent, correct, and fully covered by new tests.

Files Reviewed (13 files — full PR)

• apps/web/src/app/api/internal/code-review-status/[reviewId]/route.test.ts
• apps/web/src/lib/code-reviews/action-required-shared.ts
• apps/web/src/lib/code-reviews/action-required.test.ts
• apps/web/src/lib/code-reviews/action-required.ts
• apps/web/src/lib/code-reviews/alerting/detectors.test.ts
• apps/web/src/lib/code-reviews/dispatch/dispatch-pending-reviews.test.ts
• apps/web/src/routers/admin-code-reviews-router.test.ts
• apps/web/src/routers/admin-code-reviews-router.ts
• packages/db/src/schema-types.ts
• packages/worker-utils/src/cloud-agent-next-client.ts
• services/code-review-infra/src/code-review-orchestrator.ts
• services/code-review-infra/src/types.ts
• services/code-review-infra/test/integration/code-review-orchestrator.test.ts

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_{Reviewed by claude-4.6-sonnet-20260217 · 1,170,355 tokens}

_{Review guidance: REVIEW.md from base branch main}