feat: add Codex-compatible workflows

[topij]

Summary

• move the four core workflows into runtime-neutral shared definitions
• add native Codex skills while retaining thin Claude command adapters
• make review/model/launcher configuration runtime-aware
• fix repository-root discovery for engines vendored under scripts/devkit
• resolve archive paths from config/dev-model.yaml
• add portability tests and GitHub Actions coverage
• share safety-critical doctrine across Claude rules and AGENTS.md guidance

Verification

• python -m pytest scripts/lib/state_paths/tests scripts/tests -q — 60 passed
• shell syntax checks passed for the bootstrap, lane engines, shared root helper, and pre-push hook
• Ruff checks passed on the Python engines and tests
• Codex skill validation passed for session-start, wrap-up, pr-watch, and parallel
• archive dry-run, document-budget, lane-contract, and session-board smoke checks passed

Review focus

This changes lane-launch and safety-contract behavior. Please review repository-root
resolution, runtime launcher selection, and the shared-workflow adapter boundary
before merge.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ddd2d85f-d6b0-4131-ba24-dff8915ddf2b

📥 Commits

Reviewing files that changed from the base of the PR and between dbea7dc and 30fbd93.

📒 Files selected for processing (38)

• .agents/skills/parallel/SKILL.md
• .agents/skills/parallel/agents/openai.yaml
• .agents/skills/pr-watch/SKILL.md
• .agents/skills/pr-watch/agents/openai.yaml
• .agents/skills/session-start/SKILL.md
• .agents/skills/session-start/agents/openai.yaml
• .agents/skills/wrap-up/SKILL.md
• .agents/skills/wrap-up/agents/openai.yaml
• .claude/commands/adopt.md
• .claude/commands/parallel.md
• .claude/commands/pr-watch.md
• .claude/commands/session-start.md
• .claude/commands/wrap-up.md
• .claude/rules/safety-critical-changes.md
• .github/workflows/test.yml
• README.md
• config/dev-model.yaml
• docs/AGENTS-sections.md
• docs/CLAUDE-sections.md
• docs/agentic-dev-kit/safety-critical-changes.md
• docs/agentic-dev-kit/workflows/parallel.md
• docs/agentic-dev-kit/workflows/pr-watch.md
• docs/agentic-dev-kit/workflows/session-start.md
• docs/agentic-dev-kit/workflows/wrap-up.md
• docs/autonomous-session-playbook.md
• docs/friction-log-archive.md
• docs/getting-started.md
• docs/handoff-history.md
• docs/handoff.md
• docs/parallel-dev.md
• docs/parallel-howto.md
• init.sh
• scripts/archive_plan_sessions.py
• scripts/dev_session.sh
• scripts/lib/repo_root.sh
• scripts/pr_watch.py
• scripts/reconcile_sessions.sh
• scripts/tests/test_portability.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/codex-compatibility

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