Merge remote-tracking branch 'upstream/main' into feat/openrouter-combined-tools-schema

# Conflicts:
#	testing/e2e/src/lib/feature-support.ts

Author: season179

.changeset/activity-abort-timeout.md

@@ -0,0 +1,10 @@
+---
+'@tanstack/ai': minor
+'@tanstack/ai-fal': minor
+---
+
+feat(ai): add `timeout` and `abortSignal` to media generation activities
+
+Media activities (`generateImage`, `generateAudio`, `generateVideo`, `generateSpeech`, `generateTranscription`, and `summarize`) now accept optional `timeout` and `abortSignal`. Core composes them into a request-specific effective signal, races the adapter call so hung providers reject, clears timeout resources on settle, and routes aborts to middleware `onAbort` (not `onError`).
+
+`@tanstack/ai-fal` forwards the signal to `fal.subscribe()` / `fal.queue.submit()` per request — never via global `fal.config()` — so concurrent generations stay isolated.