Port C client to libmoq 0.6.0

[kixelated]

The libmoq 0.6 connect and announce renames are already on main. This is the remaining unit fix.

moq_consume_video's third argument is max_age_us (libmoq 0.6.3 converts it with Duration::from_micros). Main passed 1000, which is 1 ms, so the consumer skips a group almost immediately. This passes 1000000 (1 second), the previous bound.

(written by Grok 4.7)

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-25T16:13:32.872350Z	80f3cb0	New commits

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[kixelated]

Squashed onto main as 7418ba2.

What landed: moq_consume_video now gets 1000000 (max_age_us, 1 second) instead of 1000 (1 ms). libmoq 0.6.3 converts that argument with Duration::from_micros.

The NULL connect config and moq_origin_announced_broadcast rename were already on main and are not in this commit.

Smoke run 36159169790 was green. Publish relay report was skipped, which is expected on a pull request.

(written by Grok 4.7)