[CLAUDE] Docs: S40 finish bulletin MUC 2+4 gaps (tiered agent-def + rag.json path fix + archive dirs)

MUC 2 (Tiered Memory) finish:
- investigator-codebase.md: ">20KB force-read" + ">25KB suggest curate" -> tiered L1/L2/L3 (last agent-def with old policy wording; gotcha count 53->55)
- archive/ created for 3 new seed agents (investigator-api/implementer-frontend/test-specialist) via .gitkeep

MUC 4 (RAG v1.3) finish:
- rag.json extra_corpus slug FIX: D--Dropbox-CONG-VIEC-SOLUTION -> ...-SOLUTION-SOLUTION-ERP (27 user-memory feedback entries were NOT indexed). Re-index = AI_INFRA op (flagged).
- chunk_size 1500 deviation UNCHANGED (AI_INFRA mechanism decision, trial 2026-06-16). JSON valid verified.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/rag.json

@@ -15,7 +15,7 @@
     ".git/**"
   ],
   "extra_corpus": [
-    "C:\\Users\\pqhuy\\.claude\\projects\\D--Dropbox-CONG-VIEC-SOLUTION\\memory\\*.md"
+    "C:\\Users\\pqhuy\\.claude\\projects\\D--Dropbox-CONG-VIEC-SOLUTION-SOLUTION-ERP\\memory\\*.md"
   ],
   "share_to_global": true,
   "search_scope_default": ["self", "shared_global"],
@@ -39,6 +39,8 @@
   "_notes": {
     "bootstrap_command": "python D:\\Dropbox\\CONG_VIEC\\AI_INFRA\\claude-rag\\bootstrap.py --project solution_erp",
     "cross_project_ai_infra_pointer": "AI Infra centralized at D:\\Dropbox\\CONG_VIEC\\AI_INFRA\\. Cross-project tooling (RAG/MCP/Governance) — single source of truth.",
-    "layer_c_mandate": "auto_reindex_mode=replace added 2026-05-23 broadcast per VIPIX commit c029ddb — gotcha #9 RAG corpus drift fix forward"
+    "layer_c_mandate": "auto_reindex_mode=replace added 2026-05-23 broadcast per VIPIX commit c029ddb — gotcha #9 RAG corpus drift fix forward",
+    "extra_corpus_path_fix_s40": "2026-05-29 S40 — corrected user-memory slug D--Dropbox-CONG-VIEC-SOLUTION -> D--Dropbox-CONG-VIEC-SOLUTION-SOLUTION-ERP (27 feedback entries were NOT indexed due to wrong slug). Re-index needed to take effect (AI_INFRA op, bootstrap.py). Flagged to AI_INFRA.",
+    "tiered_memory_v1_adopt": "2026-05-29 S40 — adopted AI_INFRA Tiered Memory Policy v1 (bulletin): L1 HOT ~30KB soft-cap / L2 archive on-demand / L3 RAG just-in-time. chunk_size 1500 deviation = AI_INFRA mechanism decision (trial 2026-06-16), NOT changed by team."
   }
 }