WASM kernel (sx_browser.ml): remove jit_failed_sentinel marking on
JIT runtime errors. Functions stay JIT-compiled and retry on next call.
Errors are data-dependent, not JIT bugs.
signal-condition: rename in CEK dispatcher so reactive 'signal' function
works. The conditions system 'signal' special form is now 'signal-condition'.
adapter-html.sx: remove cek-try wrapping island render. Errors propagate.
Island SSR: 4/5 tests pass. Header renders perfectly. Stepper ~cssx/tw
not expanding because component calls in island body aren't evaluated
by render-to-html — they're serialized as text. Needs SX adapter fix.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>