release(v4.9.6): opencode 2.x only (Issue #60) - archive the review reports, bump the lockstep version

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-598fe58e.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261018T103110Z-8a6969",
+  "base_sha": "74333f87d0c02888c2b5b281e912d97e74348c01",
+  "head_sha": "0e05b1b6777ceb837066454ac688e04a0f5d14a0",
+  "tree_sha": "c5cb1b16af283b3fdb447bafb865ba1abbfbb5a8",
+  "review_commit": "0e05b1b6777ceb837066454ac688e04a0f5d14a0",
+  "reviewer": "planner-reviewer-codex-01",
+  "job_id": "598fe58e",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-18T10:34:16Z"
+}