release(v4.9.3): u1e no longer writes the checkout's .mam/shim/herdr - archive the review reports and bump the lockstep version

Review loop (--review-only, --all-reviewer): round 1 (@3a30d7d) 4/4 PASS;
each reviewer reproduced W1 failing on the pre-fix tree. Seven #50/#55 and
leak modules (112 tests) from a clean worktree left no .mam in the
checkout.

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-8db89564.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261013T025803Z-c69408",
+  "base_sha": "42e2a7ea9bd3e2770ed8626d789193428ca3aa8b",
+  "head_sha": "3a30d7da894cdac26b7ec054b4e66fe9fa3dc8db",
+  "tree_sha": "bd43e4642f0109091f5f497b2703dcbaf8e2616b",
+  "review_commit": "3a30d7da894cdac26b7ec054b4e66fe9fa3dc8db",
+  "reviewer": "planner-reviewer-codex-01",
+  "job_id": "8db89564",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-13T03:32:19Z"
+}