Adds support for building wasm

[arcanis]

Splitting the build part out of #309

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Note

Medium Risk
Changes how all platforms select TLS (rustls vs native) and adds a new CI toolchain path; PEM client certs are unsupported on Browserpod, which could surprise users of that target.

Overview
Adds wasm32-browserpod-linux-musl to the build matrix and extends the composite build action to install the Browserpod Rust toolchain (default 2.10.0), pin libc from the Browserpod sysroot, build yarn-bin with that toolchain, and publish yarn-bin.wasm instead of native binaries for that target.

HTTP/TLS is split by target: native builds keep rustls via explicit reqwest features and use_rustls_tls(); Browserpod (wasm64 + browserpod vendor) uses default-tls and skips rustls-only APIs—PEM client identity (httpsCertFilePath / httpsKeyFilePath) returns a clear error on Browserpod. Workspace reqwest no longer enables TLS at the root; dialoguer drops default features (password only). Cpu::Wasm64 is registered for platform reporting, and cargo::rustc-check-cfg for target_vendor = "browserpod" is added in zpm / zpm-switch build scripts.

^{Reviewed by Cursor Bugbot for commit 41230f1. Bugbot is set up for automated code reviews on this repo. Configure here.}

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⏱️ Benchmark Results

gatsby install-full-cold

Metric	Base	Head	Difference
Mean	4.428s	4.467s	+0.88% ⚠️
Median	4.436s	4.474s	+0.87% ⚠️
Min	4.322s	4.357s
Max	4.504s	4.555s
Std Dev	0.044s	0.047s

📊 Raw benchmark data (gatsby install-full-cold)

Base times: 4.404s, 4.348s, 4.436s, 4.451s, 4.367s, 4.503s, 4.388s, 4.322s, 4.471s, 4.483s, 4.430s, 4.504s, 4.412s, 4.470s, 4.397s, 4.458s, 4.449s, 4.436s, 4.445s, 4.458s, 4.431s, 4.422s, 4.338s, 4.422s, 4.416s, 4.447s, 4.441s, 4.438s, 4.439s, 4.418s

Head times: 4.469s, 4.443s, 4.450s, 4.493s, 4.477s, 4.401s, 4.449s, 4.473s, 4.427s, 4.387s, 4.491s, 4.484s, 4.551s, 4.422s, 4.523s, 4.499s, 4.482s, 4.490s, 4.477s, 4.513s, 4.406s, 4.472s, 4.451s, 4.475s, 4.357s, 4.479s, 4.410s, 4.474s, 4.533s, 4.555s

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gatsby install-cache-only

Metric	Base	Head	Difference
Mean	1.301s	1.314s	+1.01% ⚠️
Median	1.296s	1.293s	-0.28% ✅
Min	1.276s	1.271s
Max	1.483s	1.904s
Std Dev	0.036s	0.112s

📊 Raw benchmark data (gatsby install-cache-only)

Base times: 1.288s, 1.278s, 1.281s, 1.282s, 1.301s, 1.297s, 1.290s, 1.296s, 1.302s, 1.277s, 1.297s, 1.304s, 1.282s, 1.302s, 1.311s, 1.301s, 1.304s, 1.300s, 1.293s, 1.319s, 1.295s, 1.287s, 1.483s, 1.304s, 1.310s, 1.276s, 1.302s, 1.291s, 1.295s, 1.279s

Head times: 1.288s, 1.292s, 1.282s, 1.280s, 1.287s, 1.291s, 1.271s, 1.292s, 1.294s, 1.288s, 1.282s, 1.301s, 1.290s, 1.329s, 1.314s, 1.303s, 1.904s, 1.307s, 1.301s, 1.298s, 1.272s, 1.280s, 1.288s, 1.316s, 1.281s, 1.303s, 1.298s, 1.298s, 1.293s, 1.297s

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gatsby install-cache-and-lock (warm, with lockfile)

Metric	Base	Head	Difference
Mean	0.360s	0.372s	+3.40% ⚠️
Median	0.360s	0.355s	-1.44% ✅
Min	0.347s	0.347s
Max	0.370s	0.841s
Std Dev	0.007s	0.089s

📊 Raw benchmark data (gatsby install-cache-and-lock (warm, with lockfile))

Base times: 0.347s, 0.352s, 0.351s, 0.353s, 0.354s, 0.352s, 0.355s, 0.361s, 0.355s, 0.356s, 0.353s, 0.353s, 0.353s, 0.355s, 0.360s, 0.367s, 0.362s, 0.359s, 0.364s, 0.361s, 0.357s, 0.363s, 0.365s, 0.370s, 0.367s, 0.370s, 0.370s, 0.364s, 0.366s, 0.368s

Head times: 0.358s, 0.355s, 0.364s, 0.358s, 0.350s, 0.841s, 0.354s, 0.348s, 0.360s, 0.349s, 0.351s, 0.350s, 0.355s, 0.352s, 0.354s, 0.356s, 0.359s, 0.366s, 0.361s, 0.347s, 0.353s, 0.353s, 0.354s, 0.354s, 0.361s, 0.357s, 0.361s, 0.361s, 0.356s, 0.354s