feat(hero): first pass from the masonic-temple reference folder

Art/reference/hero-masonic/ (15 images, git-ignored) replaces the single Wikimedia photo as the source of
truth. Two front elevations drive this pass: 02-masonictemple01.jpg, a clean street-level frontal, and
06-el-capitan-theater-frontal-fachade.jpg; 05-hollywoodmasonictemple-1922.jpg records the original masonry.

Changes:

- the blank Hero_Stylobate_LintelBand across the portals is removed - the reference has open doorways with
  steps, and they now read as three dark openings with banners above them;
- rustication(): five ashlar courses from the pavement to the portal heads, 4 cm joints proud of the wall;
- balustrade(): bottom rail, top rail and 38 balusters along the roof edge, where the reference shows a
  cresting and railing.

Still missing against the same references, and recorded: warm sandstone instead of flat pale stone, lattice
grilles in the window bays, the carved inscription, and medallions that do not read at distance.

The blend is read-only after a checkout - chmod u+w first or the save fails silently and the FBX is never
written, which happened once here.

Rows 4-6 re-rendered and pending review.

Tools/hero_facade_build.py

@@ -294,9 +294,9 @@ def build():
         cube(f"Hero_Stylobate_{pi}", (x0 + x1) / 2.0, -1.2, PEDESTAL_H / 2.0,
              x1 - x0, 2.4, PEDESTAL_H, stone)
     # Band above the openings, closing the plinth to full height between the doors.
-    cube("Hero_Stylobate_LintelBand", 0.0, -1.2, PORTAL_H + (PEDESTAL_H - PORTAL_H) / 2.0,
-         (portal_xs[-1] + gap / 2.0) - (portal_xs[0] - gap / 2.0), 2.4,
-         PEDESTAL_H - PORTAL_H, stone)
+    # The reference has no blank band across the portals - the openings run up to the entablature
+    # with the banners hanging in front of them - so this filler is gone. What stays is the thin
+    # lintel over each doorway, modelled with the portals.
     note("Hero_Stylobate", (FRONTAGE_W, 2.4, PEDESTAL_H),
          "assumption: pedestal height; four piers and a lintel band leave three recesses")
 
@@ -358,6 +358,13 @@ def build():
             cube(f"Hero_Window_{rank}_{i}", wx, WINDOW_Y, z, 2.0, 0.08, 1.9, glass)
     note("Hero_Window_x10", (2.0, 0.08, 1.9), "photographs: window bands behind the colonnade")
 
+    # --- rustication and roof cresting --------------------------------------
+    # The photographs show the ground storey in banded ashlar and a cresting with balusters along
+    # the roof edge; without them the elevation reads as a flat card.
+    # Courses run from the pavement to the portal heads, as the street-level photograph shows.
+    rustication(FRONTAGE_W, PORTAL_H, stone_dark)
+    balustrade(FRONTAGE_W, HEIGHT - PARAPET_H * 0.15, stone)
+
     # --- seat the applied detail on the wall ---------------------------------
     # Depth is a property of the façade, not of each call site: state it once here. Parts whose
     # front face is behind the wall plane are moved until it sits at FRONT_Y + offset.
@@ -372,6 +379,35 @@ def build():
     return parts, lines
 
 
+def rustication(width_m, height_m, material, course_m=0.55, joints=0):
+    """Horizontal ashlar joints cut across the ground storey.
+
+    A real façade reads as stone because of the shadow in its joints, not because of its colour.
+    Grooves are 3 cm deep and 4 cm tall, spaced `course_m`, and sit just proud of the wall so they
+    catch the light the way the photographs show.
+    """
+    z = course_m
+    count = 0
+    while z < height_m - 0.2:
+        cube(f"Hero_Course_{count:02d}", 0.0, FRONT_Y + 0.015, z,
+             width_m - 1.5, 0.04, 0.04, material)
+        count += 1
+        z += course_m
+    print(f"[hero] rustication: {count} courses at {course_m:.2f} m")
+
+
+def balustrade(width_m, z, material, spacing_m=0.62):
+    """A row of balusters with a bottom and top rail along the roof edge."""
+    half = width_m / 2.0 - 0.9
+    count = int((2 * half) / spacing_m)
+    cube("Hero_BalustradeRailBottom", 0.0, FRONT_Y - 0.05, z - 0.06, 2 * half, 0.14, 0.10, material)
+    cube("Hero_BalustradeRailTop", 0.0, FRONT_Y - 0.05, z + 0.42, 2 * half, 0.16, 0.10, material)
+    for i in range(count):
+        x = -half + i * spacing_m + spacing_m / 2.0
+        cube(f"Hero_Baluster_{i:02d}", x, FRONT_Y - 0.05, z + 0.18, 0.12, 0.12, 0.40, material)
+    print(f"[hero] balustrade: {count} balusters")
+
+
 def seat_on_front(table):
     """Move each named part so its street-facing face sits `offset` metres proud of FRONT_Y.