v2.1.1

What changed

• Updated the development, CI, package, and release toolchain to npm 12.0.2.
• Adapted the exact-package gate to npm 12's keyed npm pack --json output.
• Changed trusted publication to publish the already downloaded and verified local GitHub Release asset.
• Added retry-safe registry preflight and final SHA-256 verification without rebuilding package bytes.
• Updated the bundled restore-context skill to pin agent-session-exporter 2.1.1.

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