[#446 STEP 2] Tier 3 — web universals (10 bindings)

[hyperpolymath]

Part of #446. STEP 2 of the top-50 bindings roadmap.

Goal

File 10 sub-issues for Tier 3 bindings (broadly-useful web platform APIs).

Tier 3 contents

1. Web Audio
2. Gamepad
3. Pointer / Touch / Keyboard / IME
4. IndexedDB
5. Workers (DedicatedWorker / SharedWorker / ServiceWorker)
6. Streams (Fetch ReadableStream / WritableStream)
7. Storage / Cache API
8. Notifications
9. Geolocation / sensors
10. MediaDevices (camera/mic enumeration + getUserMedia)

Acceptance

• 10 sub-issues filed; tier-3 label
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