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Drew T 06e43873e9 feat(phase-26 T7): §52 regalloc sibling wave — 2 cores banked ×134 (268 instances)
The Fable5 walker-family idiom (§52, from the func_80178004 wall) applied by a
6-agent cheap-Opus wave over the regalloc-order reach-134 cluster:
- BANKED ×134: func_80171FFC (40 ins), func_801775E0 (67 ins) — 2 exemplars +
  266 members = 268 function-instances, 0 gate failures (family_sweep byte-gate).
- 4 precisely-characterized walls (P9), each yielding a byte-verified lever:
  func_80167714 (whole-binary near), func_80177AD4 (non-coalescing delay-slot copy),
  func_80169228 (NEW caller-saved priority-first-fit wall), func_80131A34 (save-order/
  load-hoist tension; new const-unchanging-load lever).
- §52a: the wave's new banking levers (pass-real-args/RC-10, store-base-both-arms,
  copy-chain-direction, pp-decl-schedule, const-unchanging-load/RC-3) + the two new
  intrinsic-wall classes. Fable5 DISCOVERS, cheap-Opus APPLIES.
- fn-count 84.27→84.35% (+268), instr-weighted 68.6→68.7% (+14,338 ins), distinct +2.
- R22 clean-fleet 136/136 BYTE-IDENTICAL; dedup 1840/0.
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