v0.8.7 — shortcut recording fixed

Shortcut recording could silently swallow the whole keyboard: the capture bridge waited forever on the hook's pump thread while the session was already armed, so no key ever reached the page and every recording hung. The hook now installs in the background, the bridge returns instantly, and the session state machine is unit-tested (arm/disarm/replace/TTL). Held-only chords (e.g. Super pressed and released with no second key) complete cleanly instead of hanging the recording. Super+Tab records with live chip feedback and fires as an OS-override.

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Co-Authored-By: Codebuff noreply@codebuff.com