get_merchant_profile_for_product selected the bare MERCHANT_PROFILE_COLS list
while JOINing products (which also has an id), so SQLite raised "ambiguous
column name: id" on every execution. The function runs on every purchase, so
every paid purchase on 0.2.0:52 returned HTTP 500. Replace the JOIN with an
equivalent correlated subquery, keeping merchant_profiles the only table in
FROM; behavior on NULL/missing merchant_profile_id is unchanged (no row, caller
falls back to the default profile).
Also from the verification pass:
- Add merchant_profile_provider_resolution_queries_round_trip, exercising the
previously untested runtime-prepared resolution / CRUD / preference queries.
- Repair three test call sites for the new create_invoice / create_subscription
params; capture the response body in the paid_purchase status assertion.
- Align manifest license to LicenseRef-Keysat-1.0; drop an unused import.
Grant
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