Consolidate CORS handling by introducing a shared supabase/functions/_shared/cors.ts and migrate edge functions to import from it. Remove inline cors.ts usage across functions, standardize headers (including traceparent and x-request-id), and prepare for environment-aware origins.
Corrected an import error in the `run-cleanup-jobs` edge function. The function was attempting to import from a non-existent `../_shared/cors.ts` file. This has been resolved by defining the `corsHeaders` inline within the function, aligning with the pattern used in other edge functions.
