An agent told to make a worktree and work in it left the chat on the checkout it
started in — the sidebar kept the chat in the primary branch lane while every
later command ran in the worktree.
`_reconcile_session_cwd_from_terminal` refused whenever `explicit_cwd` was set,
but `session.create` sets that for ANY session whose cwd exists on disk, and the
desktop always sends a workspace. The guard that was meant to protect a
deliberately chosen workspace (#72776) therefore disabled the follow for the
whole desktop surface.
Key the pin on `cwd_pinned`, set only by the two moves the user drives:
`session.cwd.set` (the composer's folder picker) and `session.workspace.move`
(move-to-project). A cwd a chat merely STARTED in is not a pin, so the agent's
own worktree settle re-anchors the chat and the desktop moves it to that lane.
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