docs: Update AGENTS.md and PROD.md with comprehensive operations guide

AGENTS.md (1,871 lines):
- Add complete system architecture diagram with WebSocket flow
- Document all MessageTypes (0-6) including TOOL_EXEC (type 6)
- Detail start.bas, tables.bas, {tool}.bas execution flow
- Add complete BASIC keywords reference:
  * Common: TALK, HEAR, USE KB, USE WEBSITE, ADD SUGGESTION
  * Database: GET, SAVE, FIND, FIRST/LAST/COUNT
  * Files: CREATE/READ/WRITE FILE, UPLOAD
  * HTTP: GET/POST HTTP, WEBHOOK
  * Scheduling: CREATE_TASK, WAIT, ON events
  * Memory: SET BOT MEMORY, REMEMBER, CONTEXT
  * Multi-bot: ADD BOT, DELEGATE TO, BROADCAST
  * Control flow: IF/ELSE, FOR EACH, SWITCH
  * Built-in vars: TODAY, NOW, USER, SESSION, BOT
- Include AutoTask keywords from PROMPT.md files
- Production operations guide from historical versions

PROD.md (851 lines):
- Add complete container architecture table (16 containers)
  * Service names, technologies, binary/log/data paths
  * Network access internal/external URLs
- Expand troubleshooting section:
  * Container without IPv4: diagnose + fix
  * CI/ALM permission errors: chmod, ownership
  * MinIO mc operations: setup + common commands
  * Forgejo DB: SQL queries for CI runs
  * Zitadel API v2: curl examples with Host header
  * Common errors table with quick fixes

Both files now provide day-to-day operations without LLM assistance.

Refs: Consolidated from git history and PROMPT.md files

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