Simplify the Beams post and demo

[p13i]

Simplify the Beams post and the demo it embeds.

Post:

• Body is now two short paragraphs: what the simulation is, and the controls. The model and omissions sections are gone.
• description is one sentence.
• The canvas stands alone. Removed the start overlay, the Reset/Rays/Beams/Paths/Lobe/Fullscreen buttons, the echogram and its caption, the fallback box, and the CSS and inline script that served them.

static/beams/bridge.js (deletions only, indentation kept so the diff reads):

• No longer bails when the fullscreen button is absent.
• Dropped the echogram drawing, the layer-button wiring, the reset button, and the fullscreen handling. Web Audio playback, arrival polling, pointer and key dispatch, and URL state sync are unchanged.

static/beams/index.js and index_raytracer.wasm (second commit, mechanical): rebuilt from p13i/cs bf187bad3, which draws the scene as flat 1px lines with no on-canvas text, lobes, or pulses. The loader diff is two dropped imports; the wasm shrinks from 396 KB to 306 KB.

Verified in Safari against a local copy of the post: the module starts, the canvas draws grid, walls, source rings, listener marker, and paths; click steers, arrow and scene keys work, the URL updates, and arrivals reach the audio graph. No console errors.

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Written by Claude

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