STAC re-fit v5: SHA-256 of all 209 source files for re-download verification

STAC re-fit v5: working scripts, incl. the fix-test harness behind section 7

STAC re-fit v5: fix-test variant outputs, tuning benchmarks, pilot gate record

STAC re-fit v5: 100 fitted sessions (coltrane 38, art 62), schema qpos.v3

STAC re-fit v5: run manifest, calibrations, per-session records, worker logs

STAC re-fit v5: partial corpus notes, defect probes, fix tests, videos

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initial commit