* fix(session-manager): terminate sessions even when handle is missing
Kill hard-failed with ErrIncompleteHandle before recording terminal
intent, so a session that lost its runtime/workspace handle (crash,
partial spawn) was un-killable and stuck forever on the dashboard.
MarkTerminated now runs unconditionally; each destroy step is gated
individually on whether that handle exists. If nothing is present to
tear down, the session still terminates — freed=false just signals
nothing was freed. ErrIncompleteHandle is still returned by Restore
and runtimeMessenger.Send, where a missing handle is genuinely fatal.
Updates TestKill_RefusesIncompleteHandle → TestKill_TerminatesIncompleteHandle.
* style: gofmt blank line between test functions
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Co-authored-by: AO Bot <ao-bot@composio.dev>
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