2437cf5e59
The context switch is now proven on a second arch/ABI pair. A Win64 swap_context saves the complete Win64 callee-saved set: 8 GP (rbx,rbp,rdi,rsi,r12-r15) + rsp AND xmm6-xmm15 (10 XMM, 128-bit via movups -- Win64 has callee-saved XMM, unlike SysV/aarch64), plus a Win64 scribble_verify (264-byte frame, 32-byte shadow + 16-align at each call, COFF symbols, rsp-carried return address) driving the 2-fiber mutual scribble. Built --target x86_64-windows-gnu --self-contained (PE32+, output via the Win32 WriteFile boundary -- the 1660 pattern) and run on a Windows 7 x64 VM (UTM): printed '0 0 P' -- every GP + XMM callee-saved register survived the switch. Adversarially reviewed before the VM run (worker emitted the real .s and verified every call alignment, the frame offsets, the rsp/return-address round-trip, swap ordering, and COFF naming against the Win64 ABI -- no critical/minor bugs). Locked by examples/1810-concurrency-fiber-switch-win64.sx (pinned x86_64-windows-gnu, ir-only on this non-Windows host; the VM run is the runtime-correctness provenance). Good-swap-only mutual scribble (self-validating by construction; the in-process negative control was dropped to avoid an sx fn-ptr-convention issue -- detection of this exact logic was negative-controlled on aarch64 in 1808). Suite green 736/0. The B1.3 switch is proven on aarch64 + x86_64/Win64. Next: B1.4 (Io impls / M:1 scheduler).
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