New js/layers/quakes.js — fetches the USGS all_day GeoJSON directly (ACAO:*,
no proxy), refreshes every 5 min regardless of scrub state. Quakes are
time-anchored via availability: in-window quakes appear as the slider crosses
their origin time, older-than-window quakes stay visible the whole window
(intervals clamped to [start, stop]). Magnitude ramps amber→red, size scales
with magnitude, quakes <1h old pulse (age-aware callback), labels only for
M>=4.5. Deduped by feature id across refreshes, capped at 400 (smallest mag
dropped first). HUD row "Earthquakes (USGS)" with count/max-mag status.
Also: serve.py now sends Cache-Control: no-store on all responses (was
proxy-only) so iterative js/css edits always take effect on reload — the
module graph was caching stale copies during dev.
Verified in browser: 223 quakes, 11 labeled, time-anchoring confirmed
(187 visible at -6h → 223 at now), zero console errors.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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