skip: sound whole-tile proofs for legacy FI/TN/VS fields (L74); FI -30%, TN -22%

The compiled-analytic stratum interval now certifies a legacy tile uniform only when it stays
beyond the detail envelope (and smooth-min slack for solid) with no intersecting primitive,
edit, native field, composer candidate, passage or active transition; everything else fails
closed. The stream layer uses the proof for whole-tile skips; legacy sub-tile skips stay off
(two block proofs failed the falsifier in TN).

Falsifier: full-grid reference vs skip-enabled run, identical mesh/payload/topology hashes on
every tile of all four owner views, Clang and GCC, W1/W8/W12; 20-camera sweep per strate,
0 violations; a too-tight control changed 3/184/233/238 tiles and was caught.
Whole view (8 workers): SW 2.61->2.48, FI 7.18->5.05, TN 5.97->4.63, VS 2.70->2.40 s.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Tools/verify/verify.py

@@ -125,8 +125,10 @@ def owner_hash_baseline(recipe: str, style: int) -> tuple[Path, str]:
         return (BASELINES / "owner-hash/canonical/owner-hash-surface-world-style1-v212.baseline",
                 "L67-v212")
     if recipe == "floating-islands" and style == 2:
-        return (BASELINES / "owner-hash/canonical/owner-hash-floating-islands-style2-v214.baseline",
-                "L70-v214")
+        # L74 disables a legacy sub-tile shortcut after its falsifier found false solids.
+        # Keep the old fixture intact and pin the restored full-grid density signature.
+        return (BASELINES / "owner-hash/canonical/owner-hash-floating-islands-style2-l74-fullgrid.baseline",
+                "L74-full-grid")
     raise VerificationFailure(f"no pinned owner hash baseline for {recipe} style {style}")