feat(intro): v2 — cities, accelerating sweep, detections, thriller sound design

- City engine: Esri ground, OSM buildings that rise with the scan, road
  ribbons carrying modelled traffic coloured by congestion, NYC DOT cameras,
  real ADS-B, MBTA GTFS lines + realtime vehicles, LAX runways with approach
  strobes, Fort Bragg restricted volumes, Everest terrain with contours.
- Indexing keeps accelerating into a 260-capture global sweep while the
  planet whips a full turn.
- The eye opens: aperture blades, sensor array waking, optics calibration,
  radar sweep, orbiting coordinate ring.
- Camera wall with YOLOv8n detections and a city-pulse trace.
- Ends on GOD'S EYE VIEW / OMNISCIENCE.
- audio/sfx.py: sound design only, built to sit under a music track.

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

intro-sequence/tools/finalize-v2.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# v2: sound design only (made to sit under a music track). Normalise the SFX
+# mix to -16 LUFS, keep it as a stem, and mux share + master cuts.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+node tools/export-cues.mjs
+python3 audio/sfx.py
+stats=$(ffmpeg -hide_banner -i audio/sfx.wav -af loudnorm=I=-16:TP=-1.5:LRA=14:print_format=json -f null - 2>&1 | sed -n '/^{/,/^}/p')
+g() { echo "$stats" | python3 -c "import json,sys;print(json.load(sys.stdin)['$1'])"; }
+ffmpeg -y -loglevel error -i audio/sfx.wav -af "loudnorm=I=-16:TP=-1.5:LRA=14:measured_I=$(g input_i):measured_TP=$(g input_tp):measured_LRA=$(g input_lra):measured_thresh=$(g input_thresh):linear=true,aresample=48000" -c:a pcm_s24le audio/sfx_norm.wav
+mkdir -p out/final_v2
+cp audio/sfx_norm.wav out/final_v2/GodsEyeView_FirstLight_v2_SFX_stem.wav
+for tag in 16x9 9x16; do
+  v=out/v2_video_$tag.mp4
+  [ -s "$v" ] || { echo "missing $v"; continue; }
+  ffmpeg -y -loglevel error -i $v -i audio/sfx_norm.wav -map 0:v -map 1:a -c:v copy -c:a aac -b:a 320k -shortest -movflags +faststart out/final_v2/GodsEyeView_FirstLight_v2_${tag}_master.mp4
+  ffmpeg -y -loglevel error -i $v -c:v libx264 -preset slow -b:v 16M -maxrate 24M -bufsize 32M -pass 1 -passlogfile out/final_v2/p_$tag -an -f null /dev/null
+  ffmpeg -y -loglevel error -i $v -i audio/sfx_norm.wav -map 0:v -map 1:a -c:v libx264 -preset slow -b:v 16M -maxrate 24M -bufsize 32M -pass 2 -passlogfile out/final_v2/p_$tag \
+    -pix_fmt yuv420p -colorspace bt709 -color_primaries bt709 -color_trc bt709 -c:a aac -b:a 256k -shortest -movflags +faststart out/final_v2/GodsEyeView_FirstLight_v2_${tag}.mp4
+  rm -f out/final_v2/p_$tag*
+  echo "finalized $tag"
+done
+ls -la out/final_v2