Add blood-borne transmission rewrite hint

[SonAIengine]

Summary

• add a bounded query rewrite for blood + sexually transmitted + disease/infection questions
• rewrite the lay phrase toward sexual blood borne transmission routes, matching pages that use STI/BBI transmission wording
• guard against common false positives such as blood pressure, blood sugar, and blood test contexts
• document the 54544 targeted follow-up in the DeepSeek auto-rewrite diagnostics

Validation

• uv run ruff format --check src/synaptic/agent_tools.py tests/test_agent_tools.py
• uv run ruff check src/synaptic/agent_tools.py tests/test_agent_tools.py
• uv run pytest tests/test_agent_tools.py tests/test_agent_efficiency.py tests/test_agent_search_benchmarks.py tests/test_agent_loop_projection.py
• full MS MARCO SQLite deterministic smoke: blood diseases that are sexually transmitted reaches gold doc 7068203 at rank 1 via sexual blood borne transmission routes
• DeepSeek targeted live smoke for qid 54544: reach=yes, first relevant turn 1 / call 1