feat(intro): add the First Light intro sequence

A deterministic WebGL film of God's Eye View coming online: a seed on Null
Island grows into a culture that draws the planet, indexes the surface
tile by tile, ingests the live feeds and outgrows its dish, ending on the
logo. Renders 16:9 and 9:16 frame by frame in headless Chromium; the
procedural score is locked to the same clock. Data and imagery are
fetched by the scripts in tools/ and are not committed.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqP857pippaUs6konSDfe8

intro-sequence/tools/fetch/process_tle.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+"""tle.txt (3-line TLEs, CelesTrak GROUP=active) + tle_groups.json (NORAD ids per group).
+Usage: python3 -I process_tle.py <raw_dir> <out_dir>"""
+import json, os, sys
+RAW, OUT = sys.argv[1], sys.argv[2]
+def parse(path):
+    L = [l.rstrip() for l in open(path) if l.strip()]
+    out = []
+    i = 0
+    while i + 2 < len(L) + 0 and i + 2 <= len(L) - 1:
+        if L[i+1].startswith('1 ') and L[i+2].startswith('2 '):
+            name = L[i][2:] if L[i].startswith('0 ') else L[i]
+            out.append((name.strip(), L[i+1], L[i+2])); i += 3
+        else:
+            i += 1
+    return out
+act = parse(os.path.join(RAW, 'tle_active3.txt'))
+with open(os.path.join(OUT, 'tle.txt'), 'w') as f:
+    for n, a, b in act:
+        f.write(f'{n}\n{a}\n{b}\n')
+groups, notable = {}, {}
+for g in ['stations', 'starlink', 'gps-ops', 'geo', 'weather']:
+    p = os.path.join(RAW, f'tle_{g}.txt')
+    if os.path.exists(p) and os.path.getsize(p) > 0:
+        sats = parse(p)
+        groups[g] = sorted(int(a[2:7]) for _, a, _ in sats)
+        for n, _, _ in sats[: (40 if g != 'starlink' else 3)]:
+            notable[n] = g
+epochs = sorted(a[18:32] for _, a, _ in act)
+json.dump({'groups_norad': groups, 'notable': notable}, open(os.path.join(OUT, 'tle_groups.json'), 'w'), separators=(',', ':'))
+print(len(act), {k: len(v) for k, v in groups.items()}, 'epoch range', epochs[0], epochs[-1])