Adds a unified baseline verification script
(`scripts/verify-baseline.ts`) that combines basic CPU instruction
checks and JIT stress test fixtures into a single step.
**Changes:**
- New TypeScript script replaces separate `verify-baseline-cpu.sh` and
`verify-jit-stress-qemu.sh` CI steps
- Adds Windows x64 baseline verification using Intel SDE v9.58 with
Nehalem emulation
- Linux continues to use QEMU (Nehalem for x64, Cortex-A53 for aarch64)
- SDE violations are detected by checking output for `SDE-ERROR`
messages rather than exit codes, avoiding false positives from
application errors
- JIT stress fixtures now run on every build instead of only when WebKit
changes
**Platform support:**
| Platform | Emulator | CPU Model |
|----------|----------|-----------|
| Linux x64 baseline | QEMU | Nehalem (SSE4.2, no AVX) |
| Linux aarch64 | QEMU | Cortex-A53 (no LSE/SVE) |
| Windows x64 baseline | Intel SDE | Nehalem (no AVX) |
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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