[r3dbars]

Addresses MEETING-A-10. Require an existing Audio when constructing MeetingCaptureBridge, removing its unused optional/default construction branch. The sole tracked constructor call already injects app-owned storage paths and the workspace sleep/wake notification source.

The bridge change matches the corresponding unmerged broad #2336 extraction. One caller comment is corrected to describe the host supplying that wiring. Callback setup, PCM relays, subscriptions, capture start/stop, storage paths and recording policies are unchanged. This adds no engine or input-node work and changes no Bluetooth-default handling.

Validation at ee8beb8d1335bdd65d68b6502fec5a3cc28d0b48:

• Independent full two-file diff, whole bridge and routing extension, caller, constructor/method-value/selector and internal-API review: Tools GREEN; root GREEN. The caller file’s executable bytes are identical to main.
• No new test mirrors an unreachable constructor branch. All tracked construction is explicit; this is an internal app adapter, not a public Core API removal.
• Guarded bash check.sh: 16 PASS, including forced dependencies, actual app compilation, concurrency census and source pins. Full fast and integration suites deliberately refused (each exit 3); overall canonical proof remains FAIL. Exact-head clean/stable raw JSON archived before verification.
• Standalone preflight PASS. verify-change.sh rebuilds the owned app and exits 0 with meetings SKIP because Transcripted is already running. No app quit or launch; its live-hardware advisory remains unknown.
• Full QA bench refused at its outer invocation (exit 3), not run. No native capture, hardware, real user library or mixed-suite behavior proof is claimed.

This draft is not a landed fix.