Merge remote-tracking branch 'origin/master' into codex/truncated-design

# Conflicts:
#	docs/event-producer-consumer.md
#	docs/module-graph.md
#	docs/rfc/INDEX.md
#	knip.json
#	packages/README.md
#	scripts/gen-module-graph.ts
#	tsconfig.base.json
#	tsconfig.build.json
#	tsconfig.json

packages/util/timeout/tests/timeout.spec.ts

@@ -99,7 +99,11 @@ describe('deadline — fuse with upstream', () => {
     try {
       const upstream = new AbortController()
       using d = deadline(upstream.signal, 100, 'WEB_FETCH_TIMEOUT')
-      vi.advanceTimersByTime(100) // timer fires first
+      vi.advanceTimersByTime(150) // past the 100ms deadline: the timer fires first
+      expect(d.signal.aborted).toBe(true)
+      expect(timeoutOf(d.signal)?.code).toBe('WEB_FETCH_TIMEOUT')
+      // A later upstream abort is a no-op on the already-aborted fused signal:
+      // AbortSignal.any keeps the FIRST cause, so the timeout classification stands.
       upstream.abort('too late')
       expect(timeoutOf(d.signal)?.code).toBe('WEB_FETCH_TIMEOUT')
     } finally {