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+W-jarvis exact-head verdict for mosaicstack/stack#866 @ 0905cdc292f2bb71bbc79a8513feb865ddab32ca: REQUEST_CHANGES. CI1964 and paired local suites are green, but two directly reproduced PyYAML/fallback over-rejections remain. (1) token value `! x` is accepted by PyYAML 6.0.3 as a one-character string (normal rc=0/output_bytes=2), while forced fallback rejects (rc=1/output_bytes=0); leading-indicator guard does not distinguish valid non-specific tag whitespace form from invalid `!x`. (2) NEL U+0085 inside an unrelated quoted scalar is accepted by PyYAML while preserving the token (normal rc=0/output_bytes=18), but raw_text.splitlines() splits inside the quote and fallback rejects (rc=1/output_bytes=0). Independent 607-case matrix found no fail-open emission, 7 conservative mismatches across these two classes; regression harness genuine and +114/-0 assertions. Exact SHA verdict only; any push invalidates it. DO NOT MERGE. Stale body, Gate-16 identity provenance, queue and absent named executor remain separate holds.