feat(medgemma): switch to text_generation with Gemma chat template

fix: correct logger variable and test mocks for enhanced search_direct

feat(gemini): update search anchors prompt for interventions and eligibility keywords

feat(mcp): enhance search with intervention and eligibility dimensions

feat: add Gemini rate limiting and structured logging

feat: improve MedGemma retry logic and criterion evaluation

feat: add direct ClinicalTrials.gov API v2 search methods

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: make GeminiPlanner truly async with asyncio.to_thread

feat: add trial normalization and retry logic to MCP client

feat: complete Gemini planner with all 6 methods

feat: wire MedGemma extractor to HF Inference Endpoint

Initial PoC codebase

feat: implement 3 BE service stubs with 17 TDD tests

chore: initialize project skeleton with pyproject.toml