feat: add Parlant configurable log level

feat: wire real API pipeline with demo mode and Gemini truncation fix

style: apply ruff format to entire codebase

feat: add ty type checker and fix async/type correctness

fix: cache service instances in Parlant tools to avoid per-call overhead

chore: fix lint issues across agent and test files

feat: add orchestrator entry point

feat: implement 5-state Parlant journey

feat: configure Parlant guidelines

feat: implement 7 Parlant tools

feat: implement Parlant agent setup

chore: initialize project skeleton with pyproject.toml