fix-pr

## Sub-agent contract /contract `fix-pr` turns "review feedback / red CI on PR N" into a pushed fix commit with test evidence, using worktree isolation so the operator's working tree is never disturbed. It is the composition the operator previously chained by hand: `/resolve`-style feedback interpretation + managed worktree + budget-bounded fix subagent + test gate + push. **Skip when:** the fix is a one-line suggestion the operator pointed at directly (apply inline); the PR is already green with all threads resolved (report and stop); or the work is local-only and unpushed (use `/ship`). --- ### Phase 0 — Input gate & preflight (inline, fail closed) Parse `$ARGUMENTS`: - **`pr`** — PR number or URL (required). If absent, stop: "fix-pr requires a PR number or URL." - **`repo`** — repo path from `--repo`; default: current working directory's git root. - **`no_push`** — from `--no-push`: produce the fix in a kept worktree + diff summary, no remote mutation. - **`re_review`** — from `--re-review`: after pushing, re-trigger `/review` (top-level only — see Phase 6 guard). Preflight (all inline bash; any failure → **Blocked**, do not improvise): 1. `gh auth status` — must be authenticated. Fail closed if not. 2. `gh pr view <pr> --json state,headRefName,headRepositoryOwner,isCrossRepository,mergeable,url` — PR must be OPEN. 3. **Fork guard:** if `isCrossRepository` is true and the authenticated account cannot push to the head repo, emit **Blocked** naming the fork and stop. N...