feat: review-loop-run — detached MiniMax review launcher for /review-loop artefacts

launch (per-kind prompt templates: verify/plan/spec/tests/code; best-practice +
gotcha reading sets; setsid nohup launcher; round N+1 feeds back round N),
status, counts (exit 4 on CRITICAL/HIGH). Spec + 29 dryrun tests.

Claude-Session: https://claude.ai/code/session_018LRh1S2bHJYhEgrMu3UJx8

README.md

@@ -22,6 +22,7 @@ This project uses **spec-driven development** (OpenSpec) as a testbed for agent-
 | `git-status-report` | Recursive git repo status with diff stats | Done |
 | `md-to-docx` | Markdown to DOCX conversion | Done |
 | `mm-worktree-task` | Launch a MiniMax M3 implementation sub-session in an isolated git worktree, prompt assembled from a planner work item | Done |
+| `review-loop-run` | Launch/track detached MiniMax reviews of `/review-loop` artefacts (verify, plan, spec, tests, code) from per-kind prompt templates; `counts` gates on CRITICAL/HIGH | Done |
 | `mp3-to-mp4` | Convert MP3 to MP4 with a static title card | Done |
 | `split-wezterm` | Split WezTerm pane into a rows × cols grid | Done |
 | `sync-repos` | Mirror git repos across remotes | Done |