Chat could not answer 'какая зона ПЗЗ?' — retrieval loaded only the §22
forecast run (schema 1.0); тер.зона/градрегламент/ЗОУИТ/ЕГРН live in the
analyze-1.0 run and never reached the chat context.
Add get_parcel_context_for_chat: a §19-safe whitelist slice of analyze
(fixed keys AND scalar-only values — dict/list dropped at the boundary;
ЗОУИТ zone names as a dedicated str-only capped list; no geometry/PII/raw
sub-dicts) merged into a copy of report_dict under 'parcel_context';
expose it via the sixth sectional tool get_parcel_info. Bump chat_system
prompt v2->v3 so the model uses it and no longer treats the parcel's own
ПЗЗ zone as out of scope.
Step 1 of #957. Answers parcel questions by reading the already-persisted
§22 SiteFinderReport (latest_run_for, schema "1.0", read-only) and returning
templated RU answers with engine numbers verbatim (§16, never fabricated).
Intent routing (explicit or RU keyword match) -> per-section renderers;
graceful on partial/missing sections and pending (no run / DB error) without
500s. Works with llm_enabled=False (llm_used always False); LLM composition
is Step 2. Mounted off /api/v1/chat so rbac_guard auto-requires an authed
known user.
Refs #957
