passages: continuous floor h(s) along the dense route; shell-probe oracle fix (L115, v223)

Floor height from the planner profile h(s) by horizontal projection + arc-length interpolation;
adjacent fine segments share endpoint values. Floor zero-crossing offsets max 7.8 mm (L114: up
to 73 mm); rock-floor close-ups show no ribs. The 2 L114 shell misses were oracle false positives
(points inside an overlapping bore); the oracle now checks every overlapping span; no gate relaxed.
Fast tier PASS; Clang/GCC W1/W8/W12 deterministic. Speed regression grows: near-ready +17..+31% vs
L109 (fine-segment/sample pairs 49.0M vs 19.8M). Not merged.

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

Standalone/Tools/verify/verify.py

@@ -122,11 +122,11 @@ RECIPE_RE = re.compile(
 
 def owner_hash_baseline(recipe: str, style: int) -> tuple[Path, str]:
     if recipe == "surface-world" and style == 1:
-        return (BASELINES / "owner-hash/canonical/owner-hash-surface-world-style1-v222.baseline",
-                "L114-v222-local-passage-floor-profile")
+        return (BASELINES / "owner-hash/canonical/owner-hash-surface-world-style1-v223.baseline",
+                "L115-v223-continuous-arc-length-floor-profile")
     if recipe == "floating-islands" and style == 2:
-        return (BASELINES / "owner-hash/canonical/owner-hash-floating-islands-style2-v222.baseline",
-                "L114-v222-local-passage-floor-profile")
+        return (BASELINES / "owner-hash/canonical/owner-hash-floating-islands-style2-v223.baseline",
+                "L115-v223-continuous-arc-length-floor-profile")
     raise VerificationFailure(f"no pinned owner hash baseline for {recipe} style {style}")