feat: add memory system and troubleshoot agent

Memory System:
- Add category-based memory storage (company, tech, role, location, server)
- Silent background saving via saveMemorySilently()
- Category-based overwrite (same category replaces old memory)
- Server-related pattern detection (AWS, GCP, k8s, traffic info)
- Memory management tool (list, delete)

Troubleshoot Agent:
- Session-based troubleshooting conversation (KV, 1h TTL)
- 20-year DevOps/SRE expert persona
- Support for server/infra, domain/DNS, code/deploy, network, database issues
- Internal tools: search_solution (Brave), lookup_docs (Context7)
- Auto-trigger on error-related keywords
- Session completion and cancellation support

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wrangler.toml

@@ -7,8 +7,8 @@ binding = "AI"
 
 [vars]
 ENVIRONMENT = "production"
-SUMMARY_THRESHOLD = "20"           # 프로필 업데이트 주기 (메시지 수)
-MAX_SUMMARIES_PER_USER = "3"       # 유지할 프로필 버전 수 (슬라이딩 윈도우)
+SUMMARY_THRESHOLD = "50"           # 프로필 업데이트 주기 (메시지 수)
+MAX_SUMMARIES_PER_USER = "1"       # 유지할 프로필 버전 수
 N8N_WEBHOOK_URL = "https://n8n.anvil.it.com"  # n8n 연동 (선택)
 # Admin IDs moved to secrets (see bottom of file)