Add first-party MangaPill source and distinct volume releases

docs/scraper-service.md

@@ -154,6 +154,12 @@ exclude them; missing, exact-ID and applicable volume scopes include them. Catal
 ordering puts numbered chapters first and source-ID-ordered specials afterward;
 first/last/latest operate on that ordering, not on publication timestamps.
 
+WeebCentral whole-volume releases use `special-weebcentral-volume-<release-id>`
+and a `Volume N` label rather than an invented chapter number. MangaPill is a
+first-party module in the same scraper process; its catalog and chapter HTML
+must remain on `mangapill.com`, and its page URLs must match the reviewed image
+host. It uses the ordinary source lane, pacing, checkpoint and publication rules.
+
 `existingPolicy:"skip-any"` skips a chapter when any version already exists.
 `existingPolicy:"add-source"` permits another host's version but still skips a version
 already present from the selected host. Existing version folders are never overwritten.