- Add stripe and cryptography to shared pyproject.toml
- Add recharts, @stripe/stripe-js, stripe to portal package.json (submodule)
- Add billing fields to Tenant model (stripe_customer_id, subscription_status, agent_quota, trial_ends_at)
- Add budget_limit_usd to Agent model
- Create TenantLlmKey and StripeEvent models in billing.py (AuditBase and Base respectively)
- Create KeyEncryptionService (MultiFernet encrypt/decrypt/rotate) in crypto.py
- Create compute_budget_status helper in usage.py (threshold logic: ok/warning/exceeded)
- Add platform_encryption_key, stripe_, slack_oauth settings to config.py
- Create Alembic migration 005 with all schema changes, RLS, grants, and composite index
- All 12 tests passing (key encryption roundtrip, rotation, budget thresholds)
- Add escalation pre-check in _process_message: assistant mode for escalated threads
- Add escalation post-check after LLM response: calls escalate_to_human on rule match
- Load Slack bot token unconditionally (needed for escalation DM, not just placeholders)
- Add keyword-based conversation metadata detector (billing keywords, attempt counter)
- Add no-op audit logger stub (replaced by real AuditLogger from Plan 02 when available)
- Add escalation_assignee and natural_language_escalation fields to Agent model
- Add Alembic migration 003 for new Agent columns
- AuditEvent ORM model with tenant_id, action_type, latency_ms, metadata
- KnowledgeBaseDocument and KBChunk ORM models for vector KB
- Migration 003: audit_events (immutable via REVOKE), kb_documents, kb_chunks
with HNSW index and RLS on all tables
- AuditLogger with log_llm_call, log_tool_call, log_escalation methods
- audit_events immutability enforced at DB level (UPDATE/DELETE rejected)
- [Rule 1 - Bug] Fixed CAST(:metadata AS jsonb) for asyncpg compatibility
- Add MediaType(StrEnum) and MediaAttachment(BaseModel) to shared/models/message.py
- Add media: list[MediaAttachment] field to MessageContent
- Add whatsapp_app_secret, whatsapp_verify_token, and MinIO settings to shared/config.py
- Add normalize_whatsapp_event() to gateway/normalize.py (text, image, document support)
- Create whatsapp.py adapter with verify_whatsapp_signature() and verify_hub_challenge()
- 30 new passing tests (signature verification + normalizer)
