Gold-standard Diwali Lakshmi Puja muhurat for any location + year.

This is the FIRST gold-standard rule per the architecture brief. Returns local civil date + exact Pradosh × Amavasya intersection window + methodology fingerprint (diwali_lakshmi_puja_v1).

The 200 muhurat payload (window + methodology fingerprint + meta) is the heaviest single-festival read-only SEO/AEO surface, so it is gzip-negotiated via the audited _json_response_maybe_gzip helper: the DECOMPRESSED body is byte-identical to the old return _with_meta(result) path (no contract/field/value change), and the 404 (un-resolvable year) path is unchanged. No PII; no reflected request input.

Example: GET /panchang/diwali?year=2025&lat=-33.8688&lng=151.2093&tz=Australia/Sydney