release(v4.8.9): tests no longer take the checkout's loop lock - archive the review reports and bump the lockstep version

Merge-workspace review loop (--all-reviewer): round 1 (@a93c9bf) 4/4
PASS. Full suite at a93c9bf on macOS / Python 3.9 / herdr 0.9.3 with
WORKSPACE_ROOT set to an empty sentinel: 1752 passed / 0 failed / 38
skipped; the sentinel stayed empty, the review worktree had no .mam, and
the main checkout's shim was not touched.

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

.agents/reports/planner-reviewer-codex-01/report-527f1409.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261008T234013Z-4f5d21",
+  "base_sha": "97c2946ee0e11eabcecafe6407755c33c0289218",
+  "head_sha": "a93c9bf29279f65ce0b9c9fb2c1aeea90a659420",
+  "tree_sha": "741c19ba4c17601768b06684d5843d218a72beb1",
+  "review_commit": "a93c9bf29279f65ce0b9c9fb2c1aeea90a659420",
+  "reviewer": "planner-reviewer-codex-01",
+  "job_id": "527f1409",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-09T00:45:03Z"
+}