release(v4.12.0): update skill with in-place install and an update admission gate; resume starts the monitor (Issue #72) - archive the review reports, bump the lockstep version

The update skill joins the version matrix and the lockstep test's skill list.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff

.agents/reports/reviewer-grok-01/report-a43bca93.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261027T201245Z-63c71b",
+  "base_sha": "1d63e882bc1c46e9af8484647d5091b296d8fa3f",
+  "head_sha": "ec7f5c4e57286fb3c4238b8220f39094f4640391",
+  "tree_sha": "fbadb24de60ccdae684b23e2e0a41cdf23ab81eb",
+  "review_commit": "ec7f5c4e57286fb3c4238b8220f39094f4640391",
+  "reviewer": "reviewer-grok-01",
+  "job_id": "a43bca93",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-27T21:06:27Z"
+}