{"content":"assist-base-service: harden MVC sponsor flow end to end. Replaced the old trust-the-caller commit path with template-locked signing, added sponsor v2 challenge/pre/preview/commit routes, explicit granted/reserved/spent quota accounting, sponsor quota log, sponsor challenge and outbox tables, reserved sponsor UTXO state, internal bearer-token auth for sponsor grant/pool endpoints, read-only address info, order TTL reclaim plus outbox maintenance job, and refreshed the MVC sponsor integration document. Also fixed the stale MVC parser test so go test ./... is green after the hardening.","contentType":"text/plain;utf-8","attachments":[],"quotePin":""}