feat(webapp): mollifier API mutations on buffered runs

[d-cs]

Summary

Cancel, replay, reschedule, metadata, tags, and idempotency-key-reset now succeed against a run that's still in the mollifier buffer. Mutations are applied to the buffered snapshot via Lua CAS; the drainer carries the mutation forward when it replays.

Primitives added:

• mutateWithFallback — PG-first / buffer-fallback resolver with bounded-wait safety net for entries that transition mid-mutation.
• applyMetadataMutation — buffered metadata PUT mirroring the PG-side retry loop with CAS atomicity.
• resolveRunForMutation — discriminated-union resolver used by route findResource so the route builder's pre-action 404 check sees buffered runs.

Routes wired (whole files, no GET/POST splits):

• api.v2.runs.\$runParam.cancel.ts
• api.v1.runs.\$runParam.replay.ts
• api.v1.runs.\$runParam.reschedule.ts
• api.v1.runs.\$runId.metadata.ts
• api.v1.runs.\$runId.tags.ts
• resetIdempotencyKey.server.ts

Stacked on the reads PR.

Test plan

• `pnpm run typecheck --filter webapp` passes
• `pnpm run test --filter webapp test/mollifierMutateWithFallback.test.ts` passes
• `pnpm run test --filter webapp test/mollifierApplyMetadataMutation.test.ts` passes
• `pnpm run test --filter webapp test/mollifierResolveRunForMutation.test.ts` passes

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6fd8529

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 32 packages

Name	Type
@trigger.dev/redis-worker	Patch
@internal/run-engine	Patch
@internal/schedule-engine	Patch
@trigger.dev/build	Patch
@trigger.dev/core	Patch
@trigger.dev/plugins	Patch
@trigger.dev/python	Patch
@trigger.dev/react-hooks	Patch
@trigger.dev/rsc	Patch
@trigger.dev/schema-to-json	Patch
@trigger.dev/sdk	Patch
@trigger.dev/database	Patch
@trigger.dev/otlp-importer	Patch
@trigger.dev/rbac	Patch
trigger.dev	Patch
references-ai-chat	Patch
d3-chat	Patch
references-d3-openai-agents	Patch
@internal/cache	Patch
@internal/clickhouse	Patch
@internal/llm-model-catalog	Patch
@internal/redis	Patch
@internal/replication	Patch
@internal/testcontainers	Patch
@internal/tracing	Patch
@internal/tsql	Patch
@internal/zod-worker	Patch
references-nextjs-realtime	Patch
references-realtime-hooks-test	Patch
references-realtime-streams	Patch
@internal/sdk-compat-tests	Patch
references-telemetry	Patch

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[devin-ai-integration]

Devin Review found 3 potential issues.

View 5 additional findings in Devin Review.