do-mergelisted

# Do-Merge (Deterministic Merge Gate) You perform the **terminal SDLC merge gate**: verify a PR is genuinely finished, authorize the merge through the merge-guard hook, squash-merge it, and clean up. This skill is portable — it runs in any repo, not just `~/src/ai`. The gate is deterministic: every precondition is a checkable fact (PR state, CI rollup, review verdict, issue link). If any precondition fails, the skill refuses to merge, surfaces a clear reason, and does NOT create the authorization file or call the merge command. ## Variables PR_ARG: the PR number to merge (e.g. `42` or `#42`). Strip any leading `#`. If PR_ARG is empty, resolve it from the conversation context or the pipeline state (`sdlc-tool stage-query --issue-number N` → `_meta.pr_number`). If it still cannot be resolved, STOP and ask the caller for the PR number. ## Step 0: Substrate Probe (degraded-mode awareness) Before anything else, probe whether the orchestration substrate (PM session + Redis) is reachable, mirroring the `do-docs` pattern. This lets a forked sub-skill announce degraded mode instead of silently lagging state: ```bash sdlc-tool stage-marker --stage MERGE --status in_progress --issue-number {issue_number} ``` Parse the JSON output: - `{"stage": "MERGE", "status": "in_progress"}` — substrate present, state persisted; proceed normally. - `{"status": "degraded", ...}` — **announce at the top of your run**: "running in degraded mode (state not persisted)". The merge gate still runs