web: boot a demo ROM on arrival, and a deploy script for gbc.sl0p.foo

The page fetched nothing on its own, so a visitor met an empty canvas and a
file picker. It now loads roms/gbos.gb on arrival - gbos being a Unix-ish
microkernel for the GBC, which shows off rather more of the emulator than a
title screen - with a note pointing at SELECT for its on-screen keyboard and
warning that its networking rides a link cable a browser tab doesn't have.
Dropping your own ROM still replaces it (and hides the blurb).

web/deploy.sh builds the wasm, stages index + wasm + the demo ROM, rsyncs to
/opt/sl0p/gbc and curls the three URLs back. The ROM is a build artifact of
~/dev/gbos and deliberately not vendored here; if it's missing the page falls
back to "drop in a ROM" on the 404, so the deploy still works.

Also fixes a save-path bug that would have bitten the first 128KB cart:
String.fromCharCode(...sram) throws RangeError on a spread that big, killing
the autosave. Chunked, and the whole thing is wrapped for quota errors.

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