giles b1666a5fe2 HS tests: VM step limit fix, callFn error propagation, compiler emit-set fixes ...

- sx_vm.ml: VM timeout now compares vm_insn_count > step_limit instead of
  unconditionally throwing after 65536 instructions when limit > 0
- sx_browser.ml: Expose setStepLimit/resetStepCount APIs on SxKernel;
  callFn now returns {__sx_error, message} on Eval_error instead of null
- compiler.sx: emit-set handles array-index targets (host-set! instead of
  nth) and 'of' property chains (dom-set-prop with chain navigation)
- hs-run-fast.js: New Node.js test runner with step-limit timeouts,
  SX-level guard for error detection, insertAdjacentHTML mock,
  range selection (HS_START/HS_END), wall-clock timeout in driveAsync
- hs-debug-test.js: Single-test debugger with DOM state inspection
- hs-verify.js: Assertion verification (proves pass/fail detection works)

Test results: 415/831 (50%), up from 408/831 (49%) baseline.
Fixes: set my style["color"], set X of Y, put at end of (insertAdjacentHTML).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-14 19:27:03 +00:00

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