kit 2.1.1

kit 2.1 (Reach) — native Windows. The build + ~all tests already ran on windows-latest; this closes the remaining cross-platform gaps so kit runs natively on Windows (PowerShell/cmd), not only via WSL2.

Fixed

• Native Windows: 17 cross-platform test/runtime gaps closed (verified on a windows-latest CI runner). Path handling made separator-agnostic (path.isAbsolute, path.relative containment, path.posix.join for shell-profile content, manual /+\\ split for repo-name derivation); bare-tool resolution uses where on win32 (the mise which fast path already worked); plugin adapters import via pathToFileURL (a bare C:\\... path is not a valid ESM URL); ~/.kit/bin/kit now also emits a managed kit.cmd shim on Windows; secret-file hardening asserts the platform-appropriate guarantee (icacls on NTFS, 0600 on POSIX); bumblebee cache-reuse + integrity no longer short-circuit on the platform gate. The public-surface golden snapshot is canonicalized (forward-slash + LF, pinned via .gitattributes eol=lf) so one committed snapshot matches macOS, Linux, and Windows.
• docs/PLATFORM_SUPPORT.md updated to reflect that native Windows now builds + passes the suite (residual gaps documented honestly, e.g. the bumblebee scanner binary ships POSIX-only so it honest-skips on native Windows).

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Full changelog: https://github.com/sandstream/kit/blob/v2.1.1/CHANGELOG.md

Verify this release:

git tag -v v2.1.1
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