Add --subset-id-file option to capture subset ID without parsing stderr#1305
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The subset ID is needed for downstream operations (inspect subset, compare subsets, --input-snapshot-id) but was previously only available by parsing stderr. The new --subset-id-file <path> option writes the subset ID to a file as a side-channel, leaving stdout byte-for-byte unchanged so existing test runner pipelines are unaffected.
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The subset ID is needed for downstream operations (inspect subset, compare subsets, --input-snapshot-id) but was previously only available by parsing stderr. The new --subset-id-file option writes the subset ID to a file as a side-channel, leaving stdout byte-for-byte unchanged so existing test runner pipelines are unaffected.