PoseCap: Skill for Codex

<background_information> Implements ADR-0024 and ADR-0032 (doc/adr/0032-ci-failure-is-local-gate-gap.md). Opens a PR via gh pr create with a uniform body shape (Summary / Test plan / Links). Helper posture on scope, links, and body drafting — warnings surface without refusing. Hard gate on local quality: the skill refuses to open a PR when pre-push / CI-mirror gates exit non-zero (WORKFLOW §11 — CI failure is a local gate gap). No --no-verify symmetric bypass; users who need to open a red draft invoke gh pr create --draft directly.

Codex auto-trigger on description keywords is less mature than Claude Code's. If auto-invocation does not fire when the user mentions opening a PR or submitting changes for review, invoke this skill manually. </background_information>

Route elsewhere when:

• The branch has uncommitted or unsplit work → ad-commit first.
• The user wants to merge an already-open PR → ad-merge.

Phase 1 — preflight. Check gh is installed and authenticated:

gh --version
gh auth status

If gh is missing, surface: "gh CLI not installed. Install: https://cli.github.com/ then run gh auth login. This skill cannot open the PR without it." Soft-fail — do not silently fall back to git push only.

If gh auth status fails, surface the same hint with gh auth login.

Check the branch is pushed:

git rev-parse --abbrev-ref @{u}
git rev-list --count <base>..HEAD

If no upstream is set or the branch is unpushed, prompt: "Branch not pushed to origin. Run git push -u origin <branch> first? (y/n)". On confirm, run the push and continue.

Detect the base branch:

gh repo view --json defaultBranchRef --jq .defaultBranchRef.name

Default to main if the call fails.

Run local gates before opening the PR (WORKFLOW §11 — CI failure is a local gate gap). The gate check runs after git push has landed the branch (so the pre-push hook has already fired once) and before gh pr create — the goal is to catch the case where a developer skipped the pre-push hook, ran on a different matrix leg than CI, or wired the runner incompletely, and to refuse to open the PR against a red tree:

1. Detect the pre-push tier — read lefthook.yml, .husky/pre-push, .pre-commit-config.yaml (pre-push stage), or .git/hooks/pre-push.
2. Run the detected commands explicitly. If no hook runner is detected, fall back to reading .github/workflows/*.yml (or the detected CI surface) and run its test / lint / typecheck / build commands locally.
3. Refuse on red. If any gate exits non-zero, surface: "Pre-push gate failed: . Fix locally before opening the PR — pushing red-CI diffs burns cloud minutes. Rerun ad-pr after fixing." Do not offer --no-verify or a bypass. WORKFLOW §11 binding.
4. Warn on absent gates. If no hook runner and no CI config exist, surface: "No pre-push or CI config detected — opening PR without local gate check. Wire ad-hooks for coverage." Continue.

Matrix awareness: if CI runs a multi-version matrix and local runs one version, note the gap but do not refuse — matrix mirroring belongs to ad-hooks. Refuse only on outright red.

Phase 2 — scope assembly. Gather context:

git log <base>..HEAD --pretty='%h %s'
git diff --stat <base>...HEAD

Infer the PR title:

• Dominant Conventional Commits type across <base>..HEAD. If one commit, use its type / scope / subject directly. If multiple commits and one type dominates, use that. If mixed, surface to the user: "Branch mixes feat: + fix:. Use which type for the PR title?"
• Scope = most common scope across the commits (or empty if inconsistent).
• Subject synthesized from the changes, ≤70 chars, imperative.

Detect back-links:

• Scan commit message bodies for task-NNNN, ADR-NNNN, spec-NNNN, #<issue>, Closes, Fixes, Per, See.
• Scan changed file paths for doc/tasks/NNNN-*.md, doc/adr/NNNN-*.md, doc/specs/NNNN-*.md.