Phase-29 opens by running the Phase-28 disambiguating probe before scaling any
"(cores)x(reach)" arithmetic on the legacy-PURE-non-jr "~3% as-tooled" swing number.
- NEW tools/diff_regions.py (the deferred roadmap tool): remap the exemplar exactly
as family_sweep --hseq stages it, compile at the EXEMPLAR's real opt level
(auto-detected from the Makefile -O0 rules), masked-diff vs target, classify each
member O0-FLAG / TEMPLATES / PLUMBING-ISO / REGALLOC / NO-TARGET. Composes
family_remap + match_one + masked_diff (R33).
- VERDICT (byte-proven): the 274 DIFF is dominated (~272) by two -O0 families
(0x8013c964, 0x8013c938) that family_sweep compiled -O2 (member stub files are -O2);
an -O2 compile of an -O0 target can never match. Compiled -O0 they masked-MATCH
(func_8013C964->MATCH(10), func_8013C938->MATCH(11)). 106-member sample across
nins 2..133: O0-FLAG 45 / already-banked 29 / TEMPLATES 17 / type-lift-plumbing 15 /
REGALLOC 0. ZERO codegen walls.
- The "~3% ceiling" is RETIRED (a tooling artifact — the 3rd structural wall to resolve
to tooling after B2 and SC07). The member track is a mechanical -O0 split rollout +
type-lift sweep (Task 2a), NOT a per-member grind; member_adapt.py not needed here.
- Honest scope (§52b, R14/R35): masked-MATCH is a CANDIDATE; whole-binary banking is
Task 2a's gate. Verdict + byte evidence -> docs/calibration.md + docs/decision-log.md (R31).
Drew T