Variable SerialSessionStatusConst

Canonical status literals for a SerialSession lifecycle.

Use these constants when comparing SerialSessionState.status so call sites avoid string typos and get IDE completion.

Lifecycle transitions:

idle -> connecting -> connected -> disconnecting -> idle
                               \-> error
(any)  -> unsupported   (when Web Serial API is unavailable)
(any)  -> error         (when an unrecoverable failure occurs)
(any)  -> disposed      (when dispose$ completes)
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