chore(mollifier): restore historical changeset; add buffer-extensions

Restore .changeset/mollifier-redis-worker-primitives.md to its
original content (it was already on main from the Phase 1 scaffolding
PR — should never have been touched during consolidation).

Add .changeset/mollifier-buffer-extensions.md covering the
post-scaffolding additions: idempotency lookup, snapshot mutation API,
metadata CAS, watermark listing, claim primitives, ZSET-backed queue,
ack grace TTL, drop-entry-TTL, and the @trigger.dev/core notice field.

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

Author: d-cs

.changeset/mollifier-buffer-extensions.md

@@ -0,0 +1,6 @@
+---
+"@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.

.changeset/mollifier-redis-worker-primitives.md

@@ -1,6 +1,5 @@
 ---
-"@trigger.dev/redis-worker": minor
-"@trigger.dev/core": patch
+"@trigger.dev/redis-worker": patch
 ---
 
-Add mollifier — a Redis-backed burst buffer that absorbs trigger storms in front of `engine.trigger` and materialises them into Postgres at a controlled rate via a fair drainer.
+Add MollifierBuffer and MollifierDrainer primitives for burst smoothing (scaffolding only — not active without webapp wiring).