Wait — with that regex, the first <script> it matches will be the script for loading the library: `<script src="p5.min.js"></script>` — the regex `<script>` requires an exact `<script>` opening tag, so it only matches inline scripts. OK. Syntax check passes (the replacement is unnecessary but harmless... actually, the `window.setup = function` inside the IIFE is fine as-is).

Done — `index.html` is in place at `/tmp/ws/index.html`, fully self-contained, loading the local `p5.min.js` and nothing else. **What it does:** - **~2,600 particles** advected through a Perlin-noise flow field (`noise(x·scale, y·scale, z)` mapped to an angle), with the field slowly evolving through the z-axis for organic motion. - **Fading trails**: each frame overlays a translucent dark rectangle, and particles draw short line segments from their previous to current position — smooth streaks that gradually dissolve. - **Color shifting**: HSB mode with a global hue that drifts every frame, plus per-particle hue offsets and a subtle vertical hue gradient; brightness tracks particle speed. - **Details**: - Full-screen canvas that resizes with the window; edge-wrapping without streaks across the screen. - Particles respawn after a random lifetime so trails never go stale. - Mouse proximity stirs a vortex around the cursor. - Click or press space to reseed the noise field with a fresh hue palette. Just open `index.html` in a browser — no network needed.