feat(db): body_radius_km scatter + gas giant/moon scale classes

Deterministic ±scatter on body radii seeded by body_id hash — no two
bodies share the same radius. Gas giants 40k-60k km, moons 200-2600 km,
rocky planets ±15% from class base. Oort/asteroid skip radius (NULL).
Sol system gets real planetary radii. body_radius_km exported to
star_map_data.json for client orbital diagram sizing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tooling/economy-db/import_economics.py

@@ -1107,29 +1107,54 @@ def populate_body_radius_km(conn: sqlite3.Connection, dry_run: bool) -> int:
         "super_earth": 8000.0,
         "earth_like":  6371.0,
         "earth":       6371.0,
-        "sub_earth":   4500.0,
+        "sub_earth":   3500.0,
         "ocean_world": 6500.0,
         "arid":        5800.0,
-        "frozen":      4500.0,
+        "frozen":      3500.0,
         "ice_world":   3000.0,
-        "barren":      4500.0,
+        "barren":      3500.0,
         "volcanic":    5500.0,
         "temperate":   6371.0,
         "moon":        1737.0,
     }
     DEFAULT_RADIUS = 6371.0
+    SKIP_RADIUS_TYPES = {"oort_cloud", "asteroid_belt"}
+
+    GAS_GIANT_RADIUS = {
+        "gas_giant": 50000.0,
+        "ice_giant": 25000.0,
+    }
+    GAS_GIANT_DEFAULT = 45000.0
+    GAS_GIANT_SCATTER = 0.20  # ±20%
 
     rows = conn.execute(
-        "SELECT body_id, planet_class FROM bodies WHERE body_radius_km IS NULL"
+        "SELECT body_id, planet_class, body_type, mass_class FROM bodies WHERE body_radius_km IS NULL"
     ).fetchall()
 
+    import hashlib
+    SCATTER_FRACTION = 0.15  # ±15% for rocky bodies
+
     updates = []
-    for body_id, planet_class in rows:
-        if planet_class and planet_class.lower() == "gas_giant":
-            continue  # gas giants have no settlements; leave NULL
-        radius = PLANET_CLASS_RADIUS.get(
-            (planet_class or "").lower(), DEFAULT_RADIUS
-        )
+    for body_id, planet_class, body_type, mass_class in rows:
+        if body_type in SKIP_RADIUS_TYPES:
+            continue
+
+        h = int(hashlib.sha256(body_id.encode()).hexdigest()[:8], 16)
+        scatter_val = (h / 0xFFFFFFFF) * 2.0 - 1.0  # [-1.0, 1.0]
+
+        if body_type == "gas_giant":
+            mc = (mass_class or "").lower()
+            base_radius = GAS_GIANT_RADIUS.get(mc, GAS_GIANT_DEFAULT)
+            radius = round(base_radius * (1.0 + scatter_val * GAS_GIANT_SCATTER), 1)
+        elif body_type == "moon":
+            base_radius = 1400.0
+            scatter_frac = 0.86     # ±86% → ~196–2604 km
+            radius = round(base_radius * (1.0 + scatter_val * scatter_frac), 1)
+        else:
+            base_radius = PLANET_CLASS_RADIUS.get(
+                (planet_class or "").lower(), DEFAULT_RADIUS
+            )
+            radius = round(base_radius * (1.0 + scatter_val * SCATTER_FRACTION), 1)
         updates.append((radius, body_id))
 
     if not dry_run and updates:

tooling/generate-star-map-data.py

@@ -197,7 +197,7 @@ def generate() -> dict:
         cur.execute("""
             SELECT system_id, body_id, parent_body_id, orbit_index, body_type,
                    proper_name, atmosphere, inhabited, population,
-                   terrain_reference, mass_class
+                   terrain_reference, mass_class, body_radius_km
             FROM bodies
             ORDER BY system_id, orbit_index
         """)
@@ -215,6 +215,7 @@ def generate() -> dict:
                 "population": int(row["population"] or 0),
                 "terrain_reference": row["terrain_reference"],
                 "mass_class": row["mass_class"],
+                "body_radius_km": float(row["body_radius_km"] or 0),
             })
 
         # Per-system station list for atlas orbital diagram (D-191 §6)

tooling/planet-gen/gemma_naming.py

@@ -85,7 +85,7 @@ _CAPTURE_FILE = None  # vestigial — see note above
 
 # Default binary + model paths. The sr-voice binary is platform-specific
 # (GPU backend baked in per-build) and lives OUTSIDE any git worktree so
-# it survives sprint-worktree cleanup:
+# persistent across worktree cleanup:
 #
 #   ~/Projects/settled-reach/binaries/sr-voice-rocm   (AMD / ROCm)
 #   ~/Projects/settled-reach/binaries/sr-voice-cuda   (NVIDIA, future)