Add resource QA CLI

[ChinmayK0607]

What changed

• Adds hud qa agents for Environment and Taskset agent discovery.
• Adds hud qa run with exact result selection, evidence reuse, waiting, overwrite control, JSON output, and distinct quality/request/execution exit codes.
• Adds hud qa results for resource-scoped result inspection.
• Encodes list-valued query parameters as repeated FastAPI query keys and documents the command surface.

Why

Resource QA workflows currently require direct API calls. The CLI should expose the existing Platform QA execution path without introducing another launcher, worker, result contract, or lifecycle.

Follow-up to HUD-2355.

Impact

Users can discover, run, wait for, and inspect first-class Environment and Taskset QA agents from the SDK. The CLI fails closed on incomplete Platform responses, pins exact reused attempts, and reports transport failures separately from quality failures.

Requires hud-monorepo#953 to deploy first. There are no SDK protocol or manifest compatibility changes.

Validation

Fail-to-pass coverage:

• The hud qa command did not exist on the base branch.
• Repeated subject IDs were encoded as a Python list instead of repeated query keys.
• Incomplete reused-result responses could score the wrong historical attempt.
• Network and timeout failures exited as quality failures.

Pass-to-pass coverage:

• 895 passed in the full SDK test suite, with 6 pre-existing warnings.
• 21 passed in the focused QA CLI and Platform transport tests.
• Ruff format and lint passed for all changed files.
• Pyright passed for the changed production modules.
• hud qa --help and hud qa run --help smoke tests passed.

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