chore: bootstrap repository with governance docs

Initialize git, add Apache-2.0 LICENSE, .gitattributes (LF line
endings), AGENTS.md (entry points, stack, discovery order, baseline
checks), RUNBOOK.md (dev boot, prod deploy with overlay, ingestion,
failures, rollback, scaling notes), .env.prod.example with rotated
credential placeholders, and dev-only warnings on .env.example.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/api/routes_search.py

@@ -0,0 +1,16 @@
+"""Search endpoint - lexical / semantic / hybrid."""
+
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+from app.api.schemas import SearchRequest, SearchResponse
+
+router = APIRouter(prefix="/search", tags=["search"])
+
+
+@router.post("", response_model=SearchResponse)
+def search(req: SearchRequest) -> SearchResponse:
+    from app.indexing.hybrid_search import run_search
+
+    return run_search(req)