wip(assembler): round L32 -- smooth Gradient interface at full amplitude (no rings, not flat)

Band faces now use signed distance to the displaced solid intervals, continuous across bands, so
MC interpolates the interface instead of terracing at density levels. The Gradient amplitude is
restored to width/8 (about 4 m peak-to-peak at 16 m). Ring/terrace audit at LOD0-8 on the FI floor and SW
ceiling passes; negative controls: L30 (rings) and L31 (flat) both fail. Hole/interface audits,
16 passage rows and 24/24 determinism pass. Evaluator 20. Cost vs L31 SW +1.9%, FI +1.5%.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CSFYgsdW8ejZSyiMf4qRSX

Standalone/Research/WorldAssemblerM3/Linux32/EncodeCapturesL32.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+"""Encode the near/far tint-on/off L32 captures as compact JPEGs."""
+import resource
+import subprocess
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[4]
+SOURCE = ROOT / "Saved/Linux/l32"
+DEST = Path(__file__).resolve().parent / "captures"
+DEST.mkdir(parents=True, exist_ok=True)
+captures = {
+    "fi-floor-near-tint-on": "cap-final-fi-near-on",
+    "fi-floor-near-tint-off": "cap-final-fi-near-off",
+    "fi-floor-far-tint-on": "cap-final-fi-far-on",
+    "fi-floor-far-tint-off": "cap-final-fi-far-off",
+    "sw-ceiling-near-tint-on": "cap-final-sw-near-on",
+    "sw-ceiling-near-tint-off": "cap-final-sw-near-off",
+    "sw-ceiling-far-tint-on": "cap-final-sw-far-on",
+    "sw-ceiling-far-tint-off": "cap-final-sw-far-off",
+}
+failed = False
+for output_name, input_name in captures.items():
+    source = SOURCE / f"{input_name}.png"
+    destination = DEST / f"{output_name}.jpg"
+    command = [
+        "taskset", "-c", "0-11", "prlimit", "--as=6442450944", "--", "ffmpeg",
+        "-y", "-hide_banner", "-loglevel", "error", "-i", str(source),
+        "-frames:v", "1", "-q:v", "4", str(destination),
+    ]
+    result = subprocess.run(command, check=False)
+    size = destination.stat().st_size if destination.exists() else 0
+    ok = source.exists() and result.returncode == 0 and size <= 300_000
+    failed |= not ok
+    print(f"[L32CaptureJPEG] source={source.name} output={destination.name} "
+          f"bytes={size} status={'PASS' if ok else 'FAIL'}", flush=True)
+print(f"[L32CaptureJPEG] peak_rss_kib="
+      f"{resource.getrusage(resource.RUSAGE_SELF).ru_maxrss}", flush=True)
+raise SystemExit(1 if failed else 0)