M3 of pinned terminals (v0.17.0):
- reconcileAgentTerminals skips removal of agent tabs with pin !== undefined
(the agent closed them / pty exited, but the user pinned them)
- The xterm reconnect-failure banner is the user-visible 'disconnected'
signal (design M3 convergence: no title suffix, no meta write)
- A later push reviving the same uuid is a no-op (id already exists)
- Unpinned agent tabs still remove as before; toAdd path unaffected
HuanLinOTO