feat(runtime): wire plan-to-git Claude hooks and PR sync

[skulidropek]

Summary

• Pins generated project containers to a plan-to-git build with Claude Code capture, temp-backed state, and sync --pr.
• Installs a shared /opt/docker-git/hooks/plan-to-git-sync helper that syncs all queued agent plans to an explicit PR when available, with branch discovery fallback.
• Adds Claude Code Stop and UserPromptSubmit hooks via an idempotent JSON merge into CLAUDE_CONFIG_DIR/settings.json.
• Backfills both Codex and Claude histories before post-push plan sync.

Closes #397

Verification

• bun run --filter @effect-template/lib test -- core/templates.test.ts
• bun --cwd packages/app vitest run tests/docker-git/core-templates.test.ts
• bun run --filter @effect-template/lib test -- core/git-post-push-wrapper.test.ts
• bun run --filter @effect-template/lib typecheck
• bun run --filter @prover-coder-ai/docker-git typecheck
• generated hook scripts extracted from renderEntrypointGitHooks() pass bash -n
• bun run check
• bun run test

Mathematical Guarantees

• Invariant: PLAN_TO_GIT_STATE_DIR defaults to /tmp/plan-to-git, so hook state stays outside the git checkout unless explicitly overridden.
• Invariant: Claude settings merge preserves existing settings and appends the managed hook only when missing.
• Invariant: one sync helper processes queued state across agent sources; Codex, Claude Code, Grok/future supported agents share the same plan-to-git sync path.
• Postcondition: if a PR number is known through env or REPO_REF=refs/pull/<n>/head, runtime calls plan-to-git sync --pr <n>; otherwise it falls back to current branch discovery.

[skulidropek]

AI Session Backup

Commit: 8a14af1
Status: success
Files: 12 (7.06 MB)
Links: README | Manifest

git status

On branch issue-397-plan-to-git-hooks-sync
Your branch is up to date with 'origin/issue-397-plan-to-git-hooks-sync'.

nothing to commit, working tree clean

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: e273d49b-f54f-4ea9-a28a-fd23a259d0b3

📥 Commits

Reviewing files that changed from the base of the PR and between 8889c5c and 9879e5a.

📒 Files selected for processing (10)

• .changeset/plan-to-git-claude-hooks.md
• packages/app/src/lib/core/templates-entrypoint/git-hooks.ts
• packages/app/src/lib/core/templates-entrypoint/plan-to-git.ts
• packages/app/src/lib/core/templates/dockerfile-prelude.ts
• packages/app/tests/docker-git/core-templates.test.ts
• packages/lib/src/core/templates-entrypoint/git-hooks.ts
• packages/lib/src/core/templates-entrypoint/plan-to-git.ts
• packages/lib/src/core/templates/dockerfile-prelude.ts
• packages/lib/tests/core/git-post-push-wrapper.test.ts
• packages/lib/tests/core/templates.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-397-plan-to-git-hooks-sync

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[skulidropek]

AI Session Backup

Commit: 9879e5a
Status: success
Files: 13 (7.99 MB)
Links: README | Manifest

git status

On branch issue-397-plan-to-git-hooks-sync
Your branch is up to date with 'origin/issue-397-plan-to-git-hooks-sync'.

nothing to commit, working tree clean