fix(agent-manager): keep PTYs durable across reloads - #13209
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Agent Manager terminals are backed by PTYs owned by the shared CLI process, but the previous lifecycle tied PTY state to transient instance and webview lifetimes. Reloads, worktree deletion, failed setup, and shutdown could leave shells running, lose output, or delete worktree state before cleanup completed.
The PTY registry now keeps sessions process-wide, scopes them by directory and workspace, retains exited output for reconnects, and terminates process trees explicitly. The Agent Manager lifecycle blocks new terminals during worktree removal, cleans PTYs before disk/state removal, retains failed cleanup entries for retry, and handles setup/import rollback paths. The server preserves location routing across instance disposal and the legacy API remains compatible with its previous exited-session behavior.