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BFM-decomp/docs
Drew T b5a28edae8 feat(phase-30): T0a — gate_stage stage-0 raw gate + fix_arity_callers per-edit journal undo (§122)
- STAGE 0: gate the RAW drafts before any transform (GATE_NO_STAGE0 escape) — the carried
  'ladder destroys good drafts' defect (SESSION-22 reproduction: _o0 pair + func_80138C60,
  ladder-FAILED/bare-VERIFIED) is impossible by construction; ladder+arity now touch only
  stage-0 failures. TU-blind-transform root-cause hypothesis recorded in-code, open.
- fix_arity_callers --journal/--undo-journal --keep: exact per-edit undo in the WRITER,
  shared by ladder AND bare workflows (the 17-TU residue class); replaces the two-special-case
  file snapshot; undo moved after stage 2 (closes the stage-2 arity parity gap); stale-journal
  guard. Negative-control: apply->undo byte-identical; --keep exact.
- Flow test .run/t0a_flowtest/driver.py 7/7 PASS. Cookbook §122. CURRENT_PHASE T0(a) logged.
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