release(v4.9.2): README rewritten against the code, README.ko.md in step - archive the review reports and bump the lockstep version

Review loop (--review-only, --all-reviewer, fact-checked against the
code): rounds 1-3 NOT PASS with factual corrections, round 4 (@62da805)
4/4 PASS. Documentation only.

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

.agents/reports/reviewer-agy-01/report-f3b2d22c.identity.json

@@ -0,0 +1,14 @@
+{
+  "loop_id": "loop-20261013T025132Z-60f239",
+  "base_sha": "ae2813773c973daedd2275cb55ad340a682c3fae",
+  "head_sha": "62da8056680fca939a2aff924037ed48b5f74afa",
+  "tree_sha": "f549246ffbe2d5e58cb7e33c212a383cd429dce5",
+  "review_commit": "62da8056680fca939a2aff924037ed48b5f74afa",
+  "reviewer": "reviewer-agy-01",
+  "job_id": "f3b2d22c",
+  "verdict": "PASS",
+  "transport": "herdr",
+  "evidence": "review-tree",
+  "isolation": "worktree",
+  "verified_at": "2026-10-13T02:56:58Z"
+}