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/.gitignore

@@ -0,0 +1,12 @@
+# Fetched snapshots and renders are regenerated by tools/; imagery and camera
+# stills carry third-party terms and are not redistributed with the repo.
+node_modules/
+/out/
+data/*.json
+data/*.txt
+!data/SOURCES.md
+/imagery/
+/cctv/
+audio/*.wav
+tools/imagery/cache/
+__pycache__/