docs(changeset): scope mollifier buffer-extensions changeset to redis-worker

Drop the @trigger.dev/core entry and notice-field claim (no core change
in this PR) and trim drainer-replay wording that belongs to a later PR.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: d-cs

.changeset/mollifier-buffer-extensions.md

@@ -1,6 +1,5 @@
 ---
 "@trigger.dev/redis-worker": minor
-"@trigger.dev/core": patch
 ---
 
-Mollifier buffer feature set built on top of the initial primitives: idempotency-lookup with SETNX dedup, atomic snapshot-mutation API (`mutateSnapshot` with tag/metadata/delay/cancel patches), metadata CAS for lossless concurrent updates, watermark-paginated listing, claim primitives for pre-gate idempotency, ZSET-backed per-env queue, 30s post-ack grace TTL, and drop the accept-time entry TTL (drainer is now the only removal mechanism). `@trigger.dev/core` gains an optional `notice` field on the trigger response so the SDK can surface mollifier-queued guidance to customers.
+Mollifier buffer extensions: idempotency dedup, an atomic `mutateSnapshot` API, metadata CAS, paginated listing, claim primitives, and a `MollifierSnapshot` type.