release(v4.9.0): Issue #50 / #55 - archive the review reports and bump the lockstep version

Merge review on macOS (--review-only loops, --all-reviewer): round 1 at
320aa9f 4/4 NOT PASS, round 2 codex F1 (a claimed dry-run job holds its
session), round 3 4/4 PASS (discarded: the worktree changed mid-review),
round 4 at 21f0c12 claude/agy/grok PASS with codex interrupted by a stream
disconnect, round 5 codex PASS. Full suite at 21f0c12 on macOS / Python
3.9 / bash 3.2 / herdr 0.9.3: 1860 passed / 0 failed / 38 skipped; no new
entries in ~/.claude/projects.

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-7ac94ed6.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261012T123226Z-e64a91",
+  "base_sha": "efd27def47a4d67684694ccf43a6ebeede01620f",
+  "head_sha": "21f0c12b9e2195cba8e196d6ccc2469173302e8a",
+  "tree_sha": "c2357ac01824d099fcbb7e9f7433b6b05f5e86a6",
+  "review_commit": "21f0c12b9e2195cba8e196d6ccc2469173302e8a",
+  "reviewer": "planner-reviewer-codex-01",
+  "job_id": "7ac94ed6",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-12T12:38:13Z"
+}