[Sunrisepeak]

Adds mcpplibs.os 0.2.2 (mcpplibs/os#9, merged; tag 0.2.2 on the merged main commit 2b46d9f, whose PR CI was green on every row: native Linux x86_64/arm64, macOS, Windows, hosted, ok images, and the new emscripten (node) dev/release). #9 replaces mcpplibs/os#8, which closed when its base branch was deleted.

• pkgs/o/os.lua: 0.2.2 in all three platform tables. GLOBAL is the GitHub tag archive, CN the byte-identical GitCode asset mcpp-res/os release 0.2.2 (sha256 33c5d946…4e3e; both downloaded and compared). mcpp xpkg parse --all-os: parse OK.
• What 0.2.2 is: the wasm32-emscripten target, over Emscripten's C library and openkal-emscripten 0.6.0 (mcpplibs.openkal-emscripten 0.6.0: written against openkal 0.17.1 #618), which the package's manifest names under cfg(os = "emscripten"); platform::emscripten, architecture::wasm32, is_emscripten; starting a program there fails at link naming the openkal symbol. Two fixes for every target: fs::read no longer reads through a 64 KiB stack array, and stamp_of / identity_of ask for the kind they read absence from.
• Member tests/examples/os moves to 0.2.2 (locally with mcpp 2026.10.27.1: test result ok, lock [email protected]). CHANGELOG entry.

This index's CI has no wasm32-emscripten row; the package's own CI runs its tests for that target under node.