fix: use PolymarketGammaProvider in integration test

Production Readiness Improvements

Merge branch 'main' into production-readiness-improvements

style: fix ruff lint errors

test: add integration tests for trading pipeline

test: add assertion to novelty market rejection test

refactor: extract liquidity tier calculation to shared utility

infra: enable deletion protection and Multi-AZ

ci: deploy all ECS services, not just API

refactor: remove unused mock _build_call_data from OrderSpec

fix: confirm getBalance selector and remove TODO

fix: align Dockerfile port with ECS configuration (8000 → 8080)

fix: resolve mypy type errors in LLM client, onchain analyzer, and test helpers

fix: Phase 5 polish, documentation, CI updates

feat: replace toy strategies with multi-strategy system (Phases 0-4)