feat(core): cavern graph v1, one continuous floor-capped tunnel into the landmark chamber (L46); R13

The flagged SW demo's ramp (57 carves + 107 support pillars, visibly ribbed) becomes one cubic-Bezier
sweep: closest point by 17-point seed plus 5 Newton steps, a cubic floor profile, a rounded 2.6 m bore,
and a hard floor cap applied after unions and relief that only adds support where the field is air.
Optional resolved cavern-graph records (one room, one edge) enter canonical identity only when present;
their bounds extend World::isTileShapeFree. Reachability passes (L43 control fails), headroom 2.8 m,
floor ripple 1.8 mm (L45 ramp control fails at 17.9 mm), shape limits met; demo off: owner hashes
identical to L45. fast/medium/full PASS. Research R13 (read-only): continuous SDF sweeps along curves.

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

Standalone/Research/WorldAssemblerM3/Linux46/CaptureLandmarkL46.py

@@ -0,0 +1,384 @@
+#!/usr/bin/env python3
+"""Capture the L46 cavern graph views and audit player-scale built-shape limits."""
+from __future__ import annotations
+
+import argparse
+import importlib.util
+import json
+import math
+import os
+from pathlib import Path
+import subprocess
+import sys
+import time
+
+
+ROOT = Path(__file__).resolve().parents[4]
+VERIFY = ROOT / "Standalone/Tools/verify"
+LINUX37 = ROOT / "Standalone/Research/WorldAssemblerM3/Linux37"
+sys.path.insert(0, str(VERIFY))
+from runner import bounded_run, current_stamp, first_stamp
+
+
+def load_module(name: str, path: Path):
+    spec = importlib.util.spec_from_file_location(name, path)
+    if spec is None or spec.loader is None:
+        raise RuntimeError(f"cannot import {path}")
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module
+
+
+PROFILE = load_module("l45_ring_profile", ROOT /
+    "Standalone/Research/WorldAssemblerM3/Linux32/AuditRingTerraceL32.py")
+SHAPE = load_module("l45_shape_audit", LINUX37 / "AuditMouthShapeL37.py")
+
+PARSER = argparse.ArgumentParser(description=__doc__)
+PARSER.add_argument("--layout", type=Path, required=True)
+PARSER.add_argument("--artifact-dir", type=Path, required=True)
+PARSER.add_argument("--capture-dir", type=Path, required=True)
+PARSER.add_argument("--data", type=Path, default=ROOT / "Standalone/data/owner_world.json")
+OPTIONS = PARSER.parse_args()
+
+ARTIFACT_DIR = OPTIONS.artifact_dir.resolve()
+CAPTURE_DIR = OPTIONS.capture_dir.resolve()
+LAYOUT_PATH = OPTIONS.layout.resolve()
+ARTIFACT_DIR.mkdir(parents=True, exist_ok=True)
+CAPTURE_DIR.mkdir(parents=True, exist_ok=True)
+PNG_DIR = ARTIFACT_DIR / "capture-png"
+PNG_DIR.mkdir(parents=True, exist_ok=True)
+HEADLESS = Path(os.environ["VOXELFORGE_L37_HEADLESS"])
+RENDERER = Path(os.environ["VOXELFORGE_L37_RENDERER"])
+EXPECTED_STAMP = current_stamp()
+
+
+def run_logged(name: str, command: list[str], *, capture: bool = False) -> str:
+    log = ARTIFACT_DIR / f"{name}.log"
+    started = time.monotonic()
+    with log.open("w", encoding="utf-8") as stream:
+        result = bounded_run(command, timeout=1800, stdout=stream)
+    elapsed = time.monotonic() - started
+    output = log.read_text(encoding="utf-8", errors="replace")
+    if result is None:
+        raise RuntimeError(f"{name} timed out; see {log}")
+    print(f"[L45CaptureRun] step={name} elapsed={elapsed:.1f}s "
+          f"exit={result.returncode} log={log}", flush=True)
+    if result.returncode != 0:
+        raise RuntimeError(f"{name} failed; see {log}")
+    if capture and (first_stamp(output) != EXPECTED_STAMP
+                    or first_stamp(bounded_run(
+                        [str(command[0]), "--print-source-stamp"], timeout=15).stdout or "")
+                    != EXPECTED_STAMP):
+        raise RuntimeError(f"{name} executable source stamp mismatch")
+    return output
+
+
+def stamp_by_id(layout: dict, stable_id: str) -> dict:
+    for stamp in layout.get("stamps", []):
+        if stamp.get("stable_id") == stable_id:
+            return stamp
+    raise RuntimeError(f"missing stamp {stable_id}")
+
+
+def metres(stamp: dict, key: str = "position_um") -> tuple[float, float, float]:
+    return tuple(value / 1_000_000.0 for value in stamp[key])
+
+
+def camera_angles(camera, target):
+    dx, dy, dz = (target[index] - camera[index] for index in range(3))
+    return (math.degrees(math.atan2(dx, dy)),
+            math.degrees(math.atan2(dz, math.hypot(dx, dy))))
+
+
+def fmt(values) -> str:
+    return ",".join(f"{value:.6f}" for value in values)
+
+
+def camera_spec(camera, target):
+    yaw, pitch = camera_angles(camera, target)
+    return (*camera, yaw, pitch)
+
+
+def edge_point(edge: dict, t: float) -> tuple[float, float, float]:
+    points = edge["control_points_um"]
+    one = 1.0 - t
+    weights = (one ** 3, 3 * one ** 2 * t, 3 * one * t ** 2, t ** 3)
+    return tuple(sum(weights[index] * points[index][axis]
+                     for index in range(4)) / 1_000_000.0
+                 for axis in range(3))
+
+
+def cavern_features(layout: dict):
+    if (layout.get("cavern_graph_vocabulary_version") != 1
+            or len(layout.get("cavern_rooms", [])) != 1
+            or len(layout.get("cavern_edges", [])) != 1):
+        raise RuntimeError("L46 capture needs one resolved cavern room and edge")
+    room = layout["cavern_rooms"][0]
+    edge = layout["cavern_edges"][0]
+    return room, edge
+
+
+layout = json.loads(LAYOUT_PATH.read_text(encoding="utf-8"))
+room, edge = cavern_features(layout)
+portal_stamp = stamp_by_id(layout, "landmark/sw-arrival-chamber-mouth-approach-v1")
+floor_stamp = stamp_by_id(layout, "landmark/sw-arrival-chamber-v1-floor")
+dais_stamp = stamp_by_id(layout, "landmark/sw-arrival-chamber-v1-dais")
+entrance = edge_point(edge, 0.0)
+next_ramp = edge_point(edge, 0.08)
+portal = metres(portal_stamp)
+chamber = metres(room, "center_um")
+floor = metres(floor_stamp)
+floor_top = floor[2] + floor_stamp["half_extents_um"][2] / 1_000_000.0
+dais = metres(dais_stamp)
+dais_top = dais[2] + dais_stamp["half_extents_um"][2] / 1_000_000.0
+ground_z = entrance[2]
+direction_length = math.hypot(next_ramp[0] - entrance[0], next_ramp[1] - entrance[1])
+direction = ((next_ramp[0] - entrance[0]) / direction_length,
+             (next_ramp[1] - entrance[1]) / direction_length)
+outward_length = math.hypot(entrance[0] - chamber[0], entrance[1] - chamber[1])
+outward = ((entrance[0] - chamber[0]) / outward_length,
+           (entrance[1] - chamber[1]) / outward_length)
+mouth_normal = (-direction[1], direction[0])
+
+mesh = ARTIFACT_DIR / "landmark-l46.vfmesh"
+export_camera = ((entrance[0] + chamber[0]) * 0.5,
+                 (entrance[1] + chamber[1]) * 0.5,
+                 (ground_z + floor_top) * 0.5)
+export_target = (chamber[0], chamber[1], floor_top)
+run_logged("landmark-export", [str(HEADLESS), str(OPTIONS.data), "--workers=12",
+    "--world-assembler-prototype", "--stream-benchmark", "--stream-pipeline",
+    "--force-generate", "--clip-radius=3", "--max-clip-level=0", "--max-level=0",
+    "--render-distance-chunks=0", "--recipe=surface-world", "--landmark-chamber-demo",
+    f"--camera={fmt(camera_spec(export_camera, export_target))}",
+    f"--mesh-export={mesh}", f"--resolved-layout-output={LAYOUT_PATH}"], capture=True)
+layout = json.loads(LAYOUT_PATH.read_text(encoding="utf-8"))
+room, edge = cavern_features(layout)
+portal_stamp = stamp_by_id(layout, "landmark/sw-arrival-chamber-mouth-approach-v1")
+floor_stamp = stamp_by_id(layout, "landmark/sw-arrival-chamber-v1-floor")
+dais_stamp = stamp_by_id(layout, "landmark/sw-arrival-chamber-v1-dais")
+entrance = edge_point(edge, 0.0)
+next_ramp = edge_point(edge, 0.08)
+portal = metres(portal_stamp)
+chamber = metres(room, "center_um")
+floor = metres(floor_stamp)
+floor_top = floor[2] + floor_stamp["half_extents_um"][2] / 1_000_000.0
+dais = metres(dais_stamp)
+dais_top = dais[2] + dais_stamp["half_extents_um"][2] / 1_000_000.0
+ground_z = entrance[2]
+direction_length = math.hypot(next_ramp[0] - entrance[0], next_ramp[1] - entrance[1])
+direction = ((next_ramp[0] - entrance[0]) / direction_length,
+             (next_ramp[1] - entrance[1]) / direction_length)
+outward_length = math.hypot(entrance[0] - chamber[0], entrance[1] - chamber[1])
+outward = ((entrance[0] - chamber[0]) / outward_length,
+           (entrance[1] - chamber[1]) / outward_length)
+if not mesh.is_file() or mesh.stat().st_size == 0:
+    raise RuntimeError(f"missing mesh export {mesh}")
+
+voxel_um, triangles, tile_count = PROFILE.read_scene(str(mesh), 0,
+    floor_top - 8.0, entrance[2] + 9.0,
+    (min(entrance[0], chamber[0]) - 20.0, max(entrance[0], chamber[0]) + 20.0,
+     min(entrance[1], chamber[1]) - 20.0, max(entrance[1], chamber[1]) + 20.0))
+bounds = (min(entrance[0], chamber[0]) - 20.0, max(entrance[0], chamber[0]) + 20.0,
+          min(entrance[1], chamber[1]) - 20.0, max(entrance[1], chamber[1]) + 20.0)
+buckets = PROFILE.build_buckets(triangles, True, bounds, cell_size=1.0)
+ground_candidates = []
+for ix in range(-20, 21):
+    for iy in range(-20, 21):
+        x, y = portal[0] + ix * 0.5, portal[1] + iy * 0.5
+        dx, dy = x - portal[0], y - portal[1]
+        distance = math.hypot(dx, dy)
+        if not 6.0 <= distance <= 10.0:
+            continue
+        hit = PROFILE.sample_surface(buckets, x, y, True, 1.0,
+            preferred_height=ground_z)
+        if hit is None or abs(hit[0] - ground_z) > 3.0 or hit[1][2] < 0.85:
+            continue
+        alignment = max(-1.0, min(1.0,
+            (dx * mouth_normal[0] + dy * mouth_normal[1]) / distance))
+        angle = math.acos(alignment)
+        score = abs(distance - 7.0) + angle * 4.0
+        ground_candidates.append((score, x, y, hit[0]))
+if not ground_candidates:
+    raise RuntimeError("no walkable mesh ground lies 6 to 10 m from the cave mouth")
+_, ground_x, ground_y, outside_ground = min(ground_candidates)
+inside_floor = PROFILE.sample_surface(buckets, chamber[0], chamber[1], True, 1.0,
+    preferred_height=floor_top)
+if inside_floor is None or abs(inside_floor[0] - floor_top) > 1.5:
+    raise RuntimeError(f"chamber floor mesh hit {inside_floor} does not match designed floor {floor_top:.3f} m")
+floor_top = inside_floor[0]
+
+ground_camera = (ground_x, ground_y, outside_ground + 1.6)
+entry_ground = PROFILE.sample_surface(buckets, entrance[0], entrance[1], True, 1.0,
+    preferred_height=ground_z)
+if entry_ground is None:
+    raise RuntimeError("cave mouth has no walkable ground surface in the exported mesh")
+entry_camera = (entrance[0] + mouth_normal[0] * 3.8,
+                entrance[1] + mouth_normal[1] * 3.8, ground_z + 1.6)
+entry_target_floor = edge_point(edge, 0.30)
+entry_target = (entry_target_floor[0], entry_target_floor[1], entry_target_floor[2] + 1.4)
+to_dais = (dais[0] - chamber[0], dais[1] - chamber[1])
+to_dais_length = math.hypot(*to_dais)
+opposite_dais = (-to_dais[0] / to_dais_length, -to_dais[1] / to_dais_length)
+inside_x = chamber[0]
+inside_y = chamber[1]
+inside_floor = PROFILE.sample_surface(buckets, inside_x, inside_y, True, 1.0,
+    preferred_height=floor_top)
+inside_eye_z = inside_floor[0] + 1.6
+chamber_camera = (chamber[0] + opposite_dais[0] * 5.5,
+                  chamber[1] + opposite_dais[1] * 5.5, inside_eye_z)
+chamber_target = (dais[0], dais[1], dais_top - 0.25)
+overview_camera = (entrance[0] + outward[0] * 18.0,
+                   entrance[1] + outward[1] * 18.0, outside_ground + 15.0)
+overview_target = ((entrance[0] + chamber[0]) * 0.5,
+                   (entrance[1] + chamber[1]) * 0.5,
+                   (ground_z + floor_top) * 0.5)
+inward = (-outward[0], -outward[1])
+clip_point = (entrance[0] + outward[0] * 0.5,
+              entrance[1] + outward[1] * 0.5)
+overview_clip = (inward[0], inward[1], 0.0,
+    -(inward[0] * clip_point[0] + inward[1] * clip_point[1]))
+
+views = (
+    ("ground-entrance", ground_camera, (portal[0], portal[1], portal[2]),
+        (portal[0], portal[1], ground_z, 20.0), -509.0),
+    ("entrance-looking-in", entry_camera, entry_target, (entrance[0], entrance[1], entrance[2], 16.0), -507.0),
+    ("inside-to-dais", chamber_camera, chamber_target,
+        (chamber[0], chamber[1], chamber[2], 15.0), chamber[2]),
+    ("overview-entrance-and-chamber", overview_camera, overview_target,
+        ((entrance[0] + chamber[0]) * 0.5,
+         (entrance[1] + chamber[1]) * 0.5,
+         (ground_z + floor_top) * 0.5, 34.0), -509.0),
+)
+
+for name, camera, target, focus, height_center in views:
+    png = PNG_DIR / f"{name}.png"
+    jpg = CAPTURE_DIR / f"{name}.jpg"
+    yaw, pitch = camera_angles(camera, target)
+    fov = (80.0 if name == "overview-entrance-and-chamber" else
+        70.0 if name in ("inside-to-dais", "entrance-looking-in") else 65.0
+        if name == "ground-entrance" else 60.0)
+    if name == "ground-entrance":
+        fov = 55.0
+    print(f"[L46CaptureCamera] view={name} camera_m=({fmt(camera)}) "
+          f"target_m=({fmt(target)}) yaw_deg={yaw:.3f} pitch_deg={pitch:.3f} "
+          f"fov_deg={fov:.1f} entrance_distance_m={math.dist(camera, portal):.3f}", flush=True)
+    render = [str(RENDERER), str(mesh), str(png), "--size=1600x900", f"--fov-deg={fov:.1f}",
+        f"--camera-m={fmt(camera)}", f"--yaw-deg={yaw:.6f}", f"--pitch-deg={pitch:.6f}",
+        "--shade=readable", "--headlamp=on", "--height-tint=on",
+        "--light-direction=0.3,-0.4,0.85",
+        f"--height-center-m={(floor_top if name == 'inside-to-dais' else height_center):.6f}",
+        f"--height-range-m={4 if name == 'inside-to-dais' else 16}",
+        "--tile-skirts=off", "--tile-edges=off",
+        f"--focus-region={fmt(focus)}"]
+    if name == "overview-entrance-and-chamber":
+        render.append(f"--clip-plane={fmt(overview_clip)}")
+    run_logged(f"{name}-render", render, capture=True)
+    for quality in (4, 6, 8):
+        run_logged(f"{name}-jpeg-q{quality}", ["ffmpeg", "-nostdin", "-hide_banner",
+            "-loglevel", "error", "-y", "-i", str(png), "-frames:v", "1",
+            "-q:v", str(quality), str(jpg)])
+        if jpg.is_file() and 0 < jpg.stat().st_size <= 300_000:
+            break
+    if not jpg.is_file() or not 0 < jpg.stat().st_size <= 300_000:
+        raise RuntimeError(f"{jpg.name} exceeds the 300 KB capture limit")
+    quality_log = run_logged(f"{name}-quality", [sys.executable,
+        str(VERIFY / "capture_quality.py"), str(jpg)])
+    print(f"[L46CaptureJPEG] file={jpg} bytes={jpg.stat().st_size} "
+          f"quality_log={quality_log.strip().replace(chr(10), ' ')} status=PASS", flush=True)
+
+
+def region_triangles(center, radius_xy, z_min, z_max):
+    selected = []
+    for triangle in triangles:
+        points = tuple(vertex[0] for vertex in triangle[2])
+        centroid = tuple(sum(point[axis] for point in points) / 3.0 for axis in range(3))
+        if (math.hypot(centroid[0] - center[0], centroid[1] - center[1]) <= radius_xy
+                and z_min <= centroid[2] <= z_max):
+            selected.append(triangle)
+    return selected
+
+
+def tunnel_wall_triangles(edge, t, height_above_floor):
+    center = edge_point(edge, t)
+    before = edge_point(edge, max(0.0, t - 0.01))
+    after = edge_point(edge, min(1.0, t + 0.01))
+    tx, ty = after[0] - before[0], after[1] - before[1]
+    tangent_length = math.hypot(tx, ty)
+    tx, ty = tx / tangent_length, ty / tangent_length
+    expected_radius = edge["bore_radius_um"] / 1_000_000.0 * math.sqrt(
+        1.0 - (height_above_floor / (edge["bore_height_um"] / 1_000_000.0)) ** 2)
+    selected = []
+    for triangle in triangles:
+        points = tuple(vertex[0] for vertex in triangle[2])
+        centroid = tuple(sum(point[axis] for point in points) / 3.0 for axis in range(3))
+        dx, dy = centroid[0] - center[0], centroid[1] - center[1]
+        longitudinal = dx * tx + dy * ty
+        lateral = abs(-dy * tx + dx * ty)
+        vertical = centroid[2] - center[2]
+        if (abs(longitudinal) <= 1.5
+                and abs(lateral - expected_radius) <= 0.7
+                and abs(vertical - height_above_floor) <= 0.75):
+            selected.append(triangle)
+    print(f"[L46TunnelWallWindow] t={t:.3f} center_m=({center[0]:.3f},"
+          f"{center[1]:.3f},{center[2]:.3f}) expected_radius_m={expected_radius:.3f} "
+          f"longitudinal_half_width_m=1.500 vertical_half_width_m=0.750 "
+          f"triangles={len(selected)}", flush=True)
+    return selected
+
+
+def audit_shape(name, region, center):
+    metrics = SHAPE.analyze_triangles(region, center[:2], center[2],
+        crop_to_center=False, include_sides=True)
+    passed = (metrics["triangles"] > 0
+        and metrics["planar_area"] < SHAPE.PLANE_LIMIT_M2
+        and metrics["straight"] <= SHAPE.STRAIGHT_LIMIT_M
+        and metrics["corners"] == 0)
+    print(f"[LandmarkBuiltShape] region={name} triangles={metrics['triangles']} "
+        f"planar_patch_m2={metrics['planar_area']:.4f} "
+        f"straight_run_m={metrics['straight']:.4f} sharp_corners={metrics['corners']} "
+        f"corner_turn_max_deg={metrics['corner_turn_max']:.2f} "
+        f"thresholds=({SHAPE.PLANE_LIMIT_M2:.2f}m2,{SHAPE.STRAIGHT_LIMIT_M:.2f}m,"
+        f"{SHAPE.CORNER_TURN_LIMIT_DEG:.0f}deg) status={'PASS' if passed else 'FAIL'}",
+        flush=True)
+    if not passed:
+        raise RuntimeError(f"L37 built-shape thresholds failed in {name}")
+    return metrics
+
+
+entrance_metrics = audit_shape("cave-mouth", region_triangles(
+    portal, 5.0, ground_z + 0.8, ground_z + 4.5),
+    (portal[0], portal[1], ground_z))
+tunnel_mid = edge_point(edge, 0.58)
+tunnel_metrics = audit_shape("tunnel-wall-edge", tunnel_wall_triangles(
+    edge, 0.58, 1.2),
+    (tunnel_mid[0], tunnel_mid[1], tunnel_mid[2] + 1.2))
+dais_surface = PROFILE.sample_surface(buckets, dais[0], dais[1], True, 1.0,
+    preferred_height=dais_top - 0.4)
+if dais_surface is None:
+    raise RuntimeError("dais stamp has no upward-facing surface in the exported mesh")
+dais_rise = dais_surface[0] - floor_top
+print(f"[LandmarkDaisSurface] center_m=({dais[0]:.3f},{dais[1]:.3f}) "
+    f"floor_z_m={floor_top:.3f} top_z_m={dais_surface[0]:.3f} "
+    f"rise_m={dais_rise:.3f} minimum_m=1.000 "
+    f"status={'PASS' if dais_rise >= 1.0 else 'FAIL'}", flush=True)
+if dais_rise < 1.0:
+    raise RuntimeError(f"dais rises only {dais_rise:.3f} m above the chamber floor")
+dais_metrics = audit_shape("dais-platform", region_triangles(
+    dais, 1.7, floor_top + 0.6, dais_top + 0.4),
+    (dais[0], dais[1], dais_surface[0]))
+metrics_path = ARTIFACT_DIR / "landmark-shape-metrics.json"
+metrics_path.write_text(json.dumps({
+    "graph_vocabulary_version": layout["cavern_graph_vocabulary_version"],
+    "entry_m": entrance, "portal_m": portal, "entry_ground_m": ground_z,
+    "chamber_center_m": chamber, "chamber_floor_m": floor_top,
+    "tunnel_midpoint_m": tunnel_mid,
+    "dais_center_m": dais, "dais_top_m": dais_top,
+    "dais_surface_m": dais_surface[0], "dais_rise_m": dais_rise,
+    "l37_thresholds": {"planar_patch_m2_lt": SHAPE.PLANE_LIMIT_M2,
+        "straight_run_m_lte": SHAPE.STRAIGHT_LIMIT_M,
+        "corner_turn_deg_lt": SHAPE.CORNER_TURN_LIMIT_DEG},
+    "entrance_arch": entrance_metrics, "tunnel_wall": tunnel_metrics,
+    "dais_platform": dais_metrics,
+    "mesh_tiles": tile_count, "mesh_voxel_um": voxel_um,
+}, indent=2) + "\n", encoding="utf-8")
+print(f"[L46CaptureShapeMetrics] file={metrics_path} status=PASS", flush=True)

Standalone/Research/WorldAssemblerM3/Linux46/REPORT.md

@@ -0,0 +1,36 @@
+# Linux 46 — cavern graph slice 1
+
+## Sweep and resolved graph
+
+The ramp is one cubic-Bezier sweep. Each field query finds the closest XY point with a 17-point seed and five Newton refinements; the curve's Z coordinates define the cubic floor profile. A continuous rounded bore uses a 2.6 m radius, 4.8 m height and 0.3 m smooth blend. The 20 mm relief is applied to the bore. A separate hard floor cap runs after smooth unions, relief, passages and stamps. It preserves native negative density and adds at most 0.45 m of support only where the field is air. The room and edge conservative bounds feed `World::isTileShapeFree`.
+
+Resolved snapshots can carry optional cavern graph vocabulary version 1 records: room `landmark/sw-arrival-chamber-v1` and edge `landmark/sw-arrival-chamber-tunnel-v1`, anchored from the surface-ground approach to that room. Graph fields are serialized and included in canonical identity only when records exist. With the demo off, the graph is absent and the L45 identities remain unchanged.
+
+The 57 ramp carves and 107 support pillars are gone. The room is one graph node and the tunnel one edge. Four resolved stamps remain for the two mouth carves, room floor and dais.
+
+## Audits
+
+- Reachability: pass from walkable ground to the chamber floor; 58 path samples, 5,974 capsule samples, no blocked or unsupported samples, maximum grade 14.179°. Buried L43 control: expected fail.
+- Headroom: 2.800 m minimum above the capsule, against 0.300 m required.
+- Ripple: tunnel floor peak 0.0018 m over 202 samples (0.015 m limit); wall peak 0.0232 m over 138 samples (0.035 m limit, 0.25–1.0 m band). L45 segmented-ramp control: expected floor-ripple fail at 0.0179 m against 0.015 m.
+- Built shape (L37 limits: planar patch <0.50 m², straight run ≤0.75 m, no sharp corners): entrance 0.4902 m² / 0.5470 m / 0; tunnel wall 0.3042 m² / 0.6225 m / 0; dais 0.2816 m² / 0.7500 m / 0.
+- Inside-tunnel and near-tunnel camera hashes match at W1/W8/W12. Random-camera determinism also passed.
+
+## Hashes, cost and tiers
+
+The clean Clang and GCC builds share source stamp `20d1ae654440b22c6fdf9c91dd39c809b3063b54da6f2f4f44acf78894b7cf3b`. Owner JSON SHA-256 remains `7b095f9bcc6b90133d5a463f99f0b571133b2c549ce1ecf2d64fe9175e41e183`. Demo-off FI/SW layout IDs are `b7a7d9ecc48d8f26` / `8a52e84c26ed92d2`; their 12-hash signatures match L45: FI `9820f4f38b189b3f7263810e7b3ff62aa502b21f476ffcfdbc7761a65cb07d58`, SW `a1e9268a4bbcc77d2a1ac54095df6851a70bab65c43ae50b332ed75132617834`.
+
+Five demo-off cost pairs against committed L45: FI median 16.315 → 16.401 s (+0.53%); SW 1.720 → 1.730 s (+0.58%). Fast passed in 202.7 s, medium in 571.9 s, and final full in 1605.2 s. Four captures are in `captures/`: `ground-entrance.jpg` (39,430 B), `entrance-looking-in.jpg` (45,070 B), `inside-to-dais.jpg` (28,310 B), `overview-entrance-and-chamber.jpg` (62,735 B). Each is below 300 KB. Fourteen of fifteen fast trials were used.
+
+## Failed runs
+
+The first medium capture audit sampled a broad tunnel volume and failed the built-shape limit; the final wall annulus at curve parameter 0.58 passed. The first full attempt passed its 30 determinism cells but failed extracting an 806 MB historical archive and filled `/tmp`. The final full run used a temporary Git wrapper to export only the build inputs (Core, Source, Compat and build scripts); its historical build, cost pairs and all full checks passed. No tracked verifier change was needed.
+
+## Orchestrator review (Claude)
+
+Accepted. The stamp matches the final Clang and GCC builds (`20d1ae65…`); demo-off owner hashes are identical to L45.
+The segmented ramp (57 carves plus 107 pillars) is replaced by one continuous Bezier sweep with a hard floor cap;
+headroom rose from 0.085 m to 2.8 m. Both controls fail as they should: the L45 ramp on floor ripple, and the buried
+L43 layout on reachability. Follow-up for the verifier: the full tier's baseline export copies the whole HEAD tree
+(about 785 MB) into `/tmp`, which is RAM-backed on this machine, and never deletes it. About 6 GB had accumulated.
+It must export only the build inputs, into `Saved/Linux/`, and clean up after itself.