Release / build-and-push (push) Successful in 3m36s
Every web-API write endpoint hardcoded Source:"web", so the Android app's own pushes landed with last_sync_source/last_modified_source "web" — the app was indistinguishable from the web SPA in progress conflicts, device_sync_data, and annotation bookkeeping. The app CAN say who it is (bookmark create already carried origin → origin_source); the server just ignored it for labeling. All six write sites (progress PUT, bookmark/note/highlight create+PUT) now parse an ADDITIVE optional "origin" key, normalized through one gate: "android"/"ios" pass through, anything absent/unknown stays "web" (the label keys conflict claims and device_sync_data — free-form client strings would pollute them). Precedence on progress: a paired X-Device-Token still outranks origin. Bookmark origin_source now rides the same gate. The web SPA sends no origin — its rows are unchanged; KOReader/Kobo handlers keep their own labels. Wire discipline: additive request keys only (rule 2), response shapes untouched, pins changelog widened in-commit, locked by TestOriginWriterAttribution (android lands, default stays web, unknown normalizes). Full battery: only the two known pre-existing failures (TestOPDSLibraryFolders rot, TestWebSocketPingPong — both reproduce with the change stashed).