[Based on #137] debug: define cross-platform acceptance gates

[cpunion]

Implements Task 7 maintenance and acceptance scaffolding for xgo-dev#2164 on top of #137.

• records the exact native, embedded, WASI, and browser tool/CI matrix
• documents artifact-role size accounting, optimized-out behavior, and transport-specific limits
• adds a guarded physical-probe fixture that cannot halt or flash without explicit operator confirmation
• validates the physical test opt-in guard in ordinary target CI
• keeps unresolved final-artifact and optimized-debug requirements visible instead of weakening validators

The umbrella issue must remain open while its explicitly listed optimization/runtime prerequisite PRs are unmerged and the Asyncify final artifact still fails clean llvm-dwarfdump verification.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[github-actions]

LLGo baseline benchmarks

456d4e49b050 | workflow run | long-term charts

Program measurements

Platform	Workload	File size	vs main	Build	vs main	Run	vs main
Linux	cprintf	19344 B	+4.3% (worse)	363.540 ms	-11.8% (better)	1.371 ms	-11.7% (better)
Linux	fmtprintf	2218832 B	+0.2% (worse)	3.340 s	-13.4% (better)	2.442 ms	-25.7% (better)
Linux	println	73832 B	+1.6% (worse)	368.179 ms	-8.0% (better)	1.619 ms	-3.2% (better)
macOS	cprintf	84672 B	+0.0%	601.913 ms	+45.3% (worse)	6.230 ms	+73.6% (worse)
macOS	fmtprintf	2361696 B	+0.7% (worse)	5.498 s	+39.5% (worse)	43.130 ms	+84.5% (worse)
macOS	println	125888 B	-0.9% (better)	665.778 ms	+60.6% (worse)	15.479 ms	+113.2% (worse)

Core language and compiler benchmarks

Platform	Benchmark	ns/op	vs main
Linux	BenchmarkLookupPCRandom	13.510 ns/op	+0.2% (worse)
Linux	BenchmarkMergeCompilerFlags	150 ns/op	-2.9% (better)
Linux	BenchmarkMergeLinkerFlags	97.280 ns/op	-4.0% (better)
Linux	BenchmarkChannelBuffered	34.910 ns/op	+0.4% (worse)
Linux	BenchmarkChannelHandoff	26772 ns/op	-16.4% (better)
Linux	BenchmarkDefer	43.770 ns/op	-22.3% (better)
Linux	BenchmarkDirectCall	1.556 ns/op	-0.4% (better)
Linux	BenchmarkGlobalRead	1.556 ns/op	-0.3% (better)
Linux	BenchmarkGlobalWrite	2.479 ns/op	-0.6% (better)
Linux	BenchmarkGoroutine	32764 ns/op	-56.7% (better)
Linux	BenchmarkInterfaceCall	8.111 ns/op	+4.1% (worse)
Linux	BenchmarkRuntimeGetG	2.178 ns/op	-59.0% (better)
macOS	BenchmarkLookupPCRandom	19.180 ns/op	+54.2% (worse)
macOS	BenchmarkMergeCompilerFlags	265 ns/op	+112.9% (worse)
macOS	BenchmarkMergeLinkerFlags	110.700 ns/op	+59.6% (worse)
macOS	BenchmarkChannelBuffered	30.400 ns/op	+9.6% (worse)
macOS	BenchmarkChannelHandoff	10175 ns/op	+45.2% (worse)
macOS	BenchmarkDefer	57.540 ns/op	+53.7% (worse)
macOS	BenchmarkDirectCall	1.243 ns/op	-14.5% (better)
macOS	BenchmarkGlobalRead	1.380 ns/op	+14.0% (worse)
macOS	BenchmarkGlobalWrite	1.591 ns/op	+7.0% (worse)
macOS	BenchmarkGoroutine	62576 ns/op	+97.7% (worse)
macOS	BenchmarkInterfaceCall	6.123 ns/op	+13.4% (worse)
macOS	BenchmarkRuntimeGetG	2.561 ns/op	-0.6% (better)

Compared only with the latest matching platform in the main series.

Warning

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