feat(audio-advanced-pipelines): make AudioDataFilterStage agent-ready

[shubhamNvidia]

Contracts only — no behavior change. Adds a describe() contract to the composite AudioDataFilterStage so the planner can see what the whole bundled pipeline reads and writes, and that it writes to disk.

It composes filtering / postprocessing / preprocessing / segmentation, so it is best merged after those.

Depends on the agent-ready foundation, #2332 — that must merge first (this branch imports nemo_curator/stages/audio/_agent/, so CI here stays red until it lands).

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[greptile-apps]

Greptile Summary

Adds the agent-ready interface and typed AudioTask boundary to AudioDataFilterStage.

• Introduces a describe() contract that marks the composite as non-wrappable.
• Declares every supported topology independent per input row.
• Depends on the separately proposed agent-ready foundation.

Confidence Score: 5/5

No unacknowledged blocking or independently actionable issue was identified in this change.

The only concrete current failure is the missing agent-ready dependency, which the PR explicitly documents as expected until prerequisite #2332 lands; no supported topology was shown to violate the new per-row-independence declaration.

Important Files Changed

Filename	Overview
nemo_curator/stages/audio/advanced_pipelines/audio_data_filter/audio_data_filter.py	Adds agent-ready inheritance and a planner-facing contract; no unacknowledged actionable defect was established.

_{Reviews (1): Last reviewed commit: "feat(audio-advanced-pipelines): make Aud..." | Re-trigger Greptile}