Commit 713425f5 713425f5e84bb3663bc54013327568c9bbecc4b3 by cnb.bofCdSsphPA

Record the transition from waiting on real FMA bytes to running a real smoke train

Constraint: The user asked for continuous staged commits, and the real milestone is the pipeline crossing from download-gated to actual dataset execution.
Rejected: Waiting for the entire smoke pipeline to finish before checkpointing | The phase transition itself is significant and already verified.
Confidence: high
Scope-risk: narrow
Directive: Keep the smoke run going, then checkpoint again with concrete train/index/eval results once the real-data pipeline completes.
Tested: Verified the archive reached full expected size, confirmed local FMA readiness with 8000 audio files and 7994 eligible queries, and observed the real smoke pipeline enter epoch-1 training with 6381 classes.
Not-tested: The full smoke pipeline outcome (final training artifact, index, and evaluation metrics) is still in progress.
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