release(v4.8.4): bump framework and eight skills to 4.8.4 in lockstep; archive PR #47 reviews (two rounds)

The .claude/skills check accepts both local layouts and fails on a dangling
link. Review: round 1 (@e1ed270) claude agy grok PASS, codex NOT PASS (a
dangling top-level link was skipped); fixed in 150b493; round 2 4/4 PASS.
Reports and the round-2 identity sidecars go to .agents/reports/<session>/.

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-5f1a5a29.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261004T044643Z-1b1440",
+  "base_sha": "e1ed2708d835d712f5f3a9dfd51b8f66ca1ac447",
+  "head_sha": "150b4937f816c6407be16fc4c37ab88e478927e7",
+  "tree_sha": "afce44d2e0f91720d81e8d7d484f0e1358dee680",
+  "review_commit": "150b4937f816c6407be16fc4c37ab88e478927e7",
+  "reviewer": "planner-reviewer-codex-01",
+  "job_id": "5f1a5a29",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-04T04:54:16Z"
+}