tools: per-strate density dispatch report in the fast tier (L132)

--density-dispatch-report prints each strate's bound path and tile shares. Owner world: SW native heightfield;
FI, TN, VS on compiled-analytic legacy fallback (FI lacks an imported FloatingIslandPlan; TN/VS have legacy recipes).
A native FI candidate broke the composed owner walk/shell gates, so the owner stays on its path. Output unchanged.

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

Standalone/Research/WorldAssemblerM3/Linux132/PrepareOwnerNativeFI.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+"""Create the isolated L132 owner snapshot with a native plan for existing FI strate 1."""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[4]
+SOURCE = ROOT / "Standalone/data/owner_world.json"
+MANIFEST = ROOT / "Saved/Linux/l132/fixtures/owner-native-fi.world-assembly.json"
+LAYOUT = ROOT / "Saved/Linux/l132/fixtures/owner-native-fi.resolved-layout.json"
+OUTPUT = ROOT / "Saved/Linux/l132/fixtures/owner_world_native_fi.json"
+
+
+def main() -> int:
+    owner = json.loads(SOURCE.read_text(encoding="utf-8"))
+    manifest_text = MANIFEST.read_text(encoding="utf-8").strip()
+    layout_text = LAYOUT.read_text(encoding="utf-8").strip()
+    manifest = json.loads(manifest_text)
+    layout = json.loads(layout_text)
+    islands = manifest.get("floating_islands", [])
+    native = [row for row in islands if row.get("strate_index") == 1]
+    resolved = [row for row in layout.get("strates", [])
+                if row.get("strate_index") == 1]
+    if len(native) != 1 or len(resolved) != 1:
+        raise SystemExit("native FI snapshot must contain exactly one strate-1 island plan/layout")
+    if (resolved[0].get("generator_kind") != "FloatingIslands"
+            or resolved[0].get("recipe_id") != "FloatingIslands.ClusterField"
+            or resolved[0].get("recipe_version") != 8):
+        raise SystemExit("resolved strate 1 is not FloatingIslands.ClusterField v8")
+    owner["world_assembly"] = manifest
+    owner["core_world_assembly_json"] = manifest_text
+    owner["resolved_layout_json"] = layout_text
+    OUTPUT.parent.mkdir(parents=True, exist_ok=True)
+    OUTPUT.write_text(json.dumps(owner, separators=(",", ":")) + "\n", encoding="utf-8")
+    print(f"[L132NativeFISnapshot] path={OUTPUT.relative_to(ROOT)} "
+          f"islands={len(native[0].get('manifest', {}).get('plan', {}).get('islands', []))} "
+          "strate=1 recipe=FloatingIslands.ClusterField/v8 status=PASS")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())