Switch monthly phase close-ups to NASA SVS Dial-a-Moon at fullscreen

The previous east-flavored composite (tight-crop east region + lunar
texture overlay) was honest but visually limited: 38-px source moon, no
real terminator shadows on quarters, and a faint upscaled-halo
background that was less compelling than just a clean lunar render.

New flow:
- East stays the witness (verifies the moon was visible during the
  collection window) and supplies the timestamp.
- moon_dialamoon.py fetches the NASA SVS Dial-a-Moon render for that
  exact UTC hour. Free, public-domain, real-physics: correct phase,
  libration, and crater shadows for any timestamp.
- moon_composite.render_phase_closeup() places that render at ~92% of
  frame height on a 1920x1080 black background -- the long-telephoto
  look the user asked for.
- One API call per phase event (~36/year), cached forever in
  moon-ref/dialamoon/.

Quarter moons now show real 3D crater shadows along the terminator,
which the prior algorithmic phase-shadow couldn't simulate from a
full-moon reference.

Adds MOON_REQUIRE_EAST_VERIFY=true|false toggle so the user can choose
"only post when east saw it" (default, current behavior) vs "post every
cycle regardless of weather over east."

Drops the install-time lunar reference download (no longer needed) and
the now-unused per-phase phase-shadow path stays in moon_composite.py
for reference / future reuse.

https://claude.ai/code/session_015PBVDESC3KLMbq1LpA6qLn

moon_composite.py

@@ -209,6 +209,47 @@ def composite_full_moon(
     return out_path
 
 
+def render_phase_closeup(
+    nasa_render_path: str,
+    out_path: str,
+    output_size: tuple[int, int] = (1920, 1080),
+    moon_height_pct: float = 0.92,
+    caption: str | None = None,
+    background: tuple[int, int, int] = (0, 0, 0),
+):
+    """Full-screen close-up rendering using a NASA SVS Dial-a-Moon image.
+
+    The dial-a-moon render already has the correct phase, libration and
+    crater shadows for the requested timestamp, so we simply size it to fill
+    the output frame on a black background and add a caption.  No east
+    compositing — the moon dominates the frame the way a 65× telephoto shot
+    would.
+    """
+    bg = Image.new('RGB', output_size, background)
+    moon = Image.open(nasa_render_path).convert('RGB')
+    moon = _square_crop_to_disk(moon)
+
+    target = int(round(output_size[1] * moon_height_pct))
+    target += target % 2
+    moon_resized = moon.resize((target, target), LANCZOS)
+
+    feather = max(3, target // 240)
+    mask = _disk_mask(target, feather_px=feather)
+
+    px = (output_size[0] - target) // 2
+    py = (output_size[1] - target) // 2
+    bg.paste(moon_resized, (px, py), mask)
+
+    if caption:
+        draw = ImageDraw.Draw(bg)
+        draw.text((24, output_size[1] - 44), caption, fill=(0, 0, 0))
+        draw.text((22, output_size[1] - 46), caption, fill=(220, 220, 220))
+
+    Path(out_path).parent.mkdir(parents=True, exist_ok=True)
+    bg.save(out_path, quality=92)
+    return out_path
+
+
 def _cli():
     p = argparse.ArgumentParser()
     p.add_argument('source')