Add aiomoqt (Python asyncio MoQT client) to implementation registry

[gmarzot]

Summary

Adds aiomoqt — a Python asyncio MoQT implementation — to the client implementation registry.

Pre-built public image: `ghcr.io/gmarzot/aiomoqt:latest` (also tagged `:0.8.1` for the initial release).

Implementation details

• Python >=3.12, built on qh3 for QUIC/H3/WebTransport.
• Supports draft-14 and draft-16 via SETUP version negotiation.
• Client role only (no relay ships yet).

Test client contract (per `TEST-CLIENT-INTERFACE.md`)

• Env vars: `RELAY_URL`, `TESTCASE`, `TLS_DISABLE_VERIFY`, `VERBOSE`
• CLI flags: `-r / --relay`, `-t / --test`, `-l / --list`, `-v / --verbose`, `--tls-disable-verify`
• Output: TAP v14 on stdout (with YAML diagnostic blocks)
• Exit codes: `0` (all passed) / `1` (any failed) / `127` (unknown test case)

Test cases registered

Standard six from the interop runner spec:

• `setup-only`
• `announce-only`
• `publish-namespace-done`
• `subscribe-error` (validates against `TRACK_DOES_NOT_EXIST`: d14 0x04 / d16 0x10)
• `announce-subscribe`
• `subscribe-before-announce`

Plus two probes (beyond the standard six):

• `fetch` — standalone FETCH against a non-existent track; accepts FETCH_OK or a benign structured FETCH_ERROR
• `join` — SUBSCRIBE + JOINING_FETCH probe

Verification

```
docker pull ghcr.io/gmarzot/aiomoqt:0.8.1
docker run --rm ghcr.io/gmarzot/aiomoqt:0.8.1 -l
docker run --rm -e RELAY_URL=moqt://moqx-main.ci.openmoq.org:4433
ghcr.io/gmarzot/aiomoqt:0.8.1 --draft 14

-> ok 1..6, TAP v14 output

```

Test plan

• Runner can pull `ghcr.io/gmarzot/aiomoqt:latest` without auth
• `TESTCASE` / `RELAY_URL` env vars propagate into the entrypoint
• TAP output parses cleanly in the runner's reporter
• Draft pairing works (`--draft 14` / `--draft 16`)

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Happy to adjust the entry or ship additional roles/test cases if useful for the runner. Thanks for maintaining this!