profile: per-term legacy FI/TN sample profiler (L76); passage/support is ~75% of field time

Opt-in at build time (VOXELFORGE_PROFILE_LEGACY_TERMS=1; compiled out by default, ~2% when on).
Per legacy sample: passage/support composer ~1.05 us vs primitive scan ~0.19 us, boundary
band ~0.06 us, noise ~0.01 us. Resolved-passage constants are cached at field binding
(arithmetic order unchanged); whole-view effect within noise. Per-tile hashes identical to L75
in all 24 compiler x worker x view comparisons; fast tier PASS; Linux UE host builds.
R40 researcher notes attached.

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

Standalone/Research/WorldAssemblerM3/Linux76/RunFinalHashCandidateOnlyL76.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""Recheck the final candidate against the L75 logs captured by RunHashMatrixL76."""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import RunHashMatrixL76 as matrix
+
+
+REFERENCE_OUT = matrix.OUT
+FINAL_OUT = matrix.ROOT / "Saved/Linux/l76/hashes/final-clean"
+matrix.OUT = FINAL_OUT
+
+
+def main() -> int:
+    FINAL_OUT.mkdir(parents=True, exist_ok=True)
+    rows, comparisons = [], []
+    for compiler in matrix.BINARIES:
+        for workers in (1, 8, 12):
+            for strate in range(4):
+                reference = REFERENCE_OUT / compiler / f"w{workers}" / f"strate{strate}-before.log"
+                candidate = matrix.run(compiler, workers, strate, "after")
+                rows.append(candidate)
+                comparison = matrix.compare(reference, matrix.ROOT / candidate["log"])
+                comparison.update(compiler=compiler, workers=workers, strate=strate)
+                comparisons.append(comparison)
+                print("[L76HashFinalCompare] " + json.dumps(comparison, sort_keys=True), flush=True)
+                if not comparison["equal"]:
+                    raise SystemExit(f"hash mismatch; see {comparison['candidate']}")
+    result = {"candidate_runs": rows, "comparisons": comparisons,
+              "equal": all(row["equal"] for row in comparisons),
+              "reference_matrix": str(REFERENCE_OUT.relative_to(matrix.ROOT))}
+    (FINAL_OUT / "summary.json").write_text(json.dumps(result, indent=2) + "\n",
+                                             encoding="utf-8")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())