chore(phase-26 T7): family_sweep --allow-pins flag + honest matched-sib finding

- family_sweep: --allow-pins bypasses the §42e pinned-exemplar skip (template WITH pins,
  byte-gate arbitrates) — added to TEST the func_8017A4AC pinned-×134 precedent.
- FINDING (3 probes, all 0% banked): the matched-sib harvest is TAPPED. tiny-IMM 0/241,
  PURE reach-134 0/134, pinned-PURE-with-pins 0/133. The manifest's ~13,075 'templatable'
  member-slots are an over-prediction the whole-binary byte-gate refuses (collision/drift/
  pin-crash). A3h + the wave propagations already banked everything cleanly templatable.
- regenerated family-hseq.md.

docs/family-hseq.md

@@ -2,11 +2,11 @@
 
 > Generated by `tools/family_hseq.py` from the 134 overlay sigs + per-overlay src stubs. Ranked by TEMPLATABLE byte-weight (PURE+IMM members × nins × 4). The byte-gate is the arbiter.
 
-**Fleet (overlays):** 84.6% fn / 68.8% instr / 49.2% distinct-code matched. Unmatched: 52,715 instances / 3,969,589 ins (31,546 distinct classes).
+**Fleet (overlays):** 84.7% fn / 68.9% instr / 49.2% distinct-code matched. Unmatched: 52,316 instances / 3,945,915 ins (31,546 distinct classes).
 
 **Tail cross-check (Phase-25 close):** 36,535 tail fns / 1,841,768 ins → 581 h_seq families ≥2, **172 substantial (nins≥80) / 1,282,261 ins**.
 
-**Full frontier (all unmatched by h_seq):** 2643 target families (≥2 members or a matched sibling) + 3550 singletons (Step-D residue). Substantial: **563 families / 2,538,194 templatable ins**, 31 with a matched sibling (zero-crack). Substantial member classes: 15,315 PURE · 39 IMM · 6 STRUCT-excluded.
+**Full frontier (all unmatched by h_seq):** 2640 target families (≥2 members or a matched sibling) + 3550 singletons (Step-D residue). Substantial: **562 families / 2,525,293 templatable ins**, 30 with a matched sibling (zero-crack). Substantial member classes: 15,182 PURE · 39 IMM · 6 STRUCT-excluded.
 
 
 ## Top substantial families (by templatable byte-weight)

tools/family_sweep.py

@@ -252,7 +252,7 @@ def hseq_sweep(a):
                     r = info.split(":")[0] if isinstance(info, str) else "skip"
                     skip[r[:24]] += 1; continue
             _code = re.sub(r'//[^\n]*', '', re.sub(r'/\*.*?\*/', '', draft, flags=re.S))
-            if re.search(r'__asm__\s*\(\s*"\$', _code):         # hard-reg pin (§42e): ×1-only, cc1-crashes
+            if not getattr(a, "allow_pins", False) and re.search(r'__asm__\s*\(\s*"\$', _code):   # hard-reg pin (§42e): ×1-only, cc1-crashes
                 skip["pinned-exemplar"] += 1; continue          # sibling TUs → skip. Strip comments first: a body
                                                                 # that DOCUMENTS a removed pin ("__asm__(\"$16\") REMOVED")
                                                                 # is pin-free code and must not be false-skipped.
@@ -318,6 +318,9 @@ def main():
     ap.add_argument("--chunk", type=int, default=8)
     ap.add_argument("--commit", action="store_true")
     ap.add_argument("--only", default=None, help="comma-separated exemplar addrs to sweep (validation)")
+    ap.add_argument("--allow-pins", action="store_true",
+                    help="bypass the §42e pinned-exemplar skip: template WITH the register pins and let the "
+                         "whole-binary byte-gate arbitrate (some pinned families bank ×134 per-sibling, e.g. func_8017A4AC).")
     ap.add_argument("--reconcile", default=None, metavar="RAWDIR",
                     help="M2 def-side-wall path: per (exemplar,sibling), symbol-remap the RAW draft in RAWDIR "
                          "then canon_sig_reconcile against the sibling TU (Q5-proven). Implies --no-preclassify.")