Retrieve a feasibility analysis

Loads a persisted feasibility analysis by UUID and returns the stored site, deterministic feasibility payload, reliability, coverage, sources, warnings, and version metadata. Authentication is optional for the public-safe snapshot; parcel owner details and assessment/sale data (site.selectedParcel.ownershipHint and rawCityData) are returned only to authenticated callers, and includeSourceContent=true expands full source content only for authenticated Supabase bearer JWT callers. The route uses the PUBLIC_READ_HEAVY route bucket behind the PUBLIC_API middleware backstop and returns registered v1 error codes including INVALID_REQUEST, AUTH_REQUIRED, RATE_LIMITED, and ANALYSIS_FAILED.