v2.17.1

Two small MCP fixes on top of v2.17.0, both dogfood-verified on a live build before tagging.

Fixed

• browser_close no longer leaves an empty pane behind. The UI close path removes a pane when its last surface is closed, but the MCP mirror only closed the surface — leaving an empty leaf that the "auto-create initial surface" effect backfilled with a fresh terminal. A browser_open/browser_close loop accreted blank PowerShell panes. The handler now snapshots whether the closed surface was the pane's last one before removing it, then cascades into closePane to mirror the UI path. A browser sharing a split pane with a terminal still only loses the surface; a browser that is a workspace's only (root) pane still gets an auto-terminal, matching the UI exactly. (#144)
• Stale pid-map anchors are pruned on workspace/pane close. The pid→ptyId anchor that backs MCP workspace-identity resolution was only pruned on session:died, so closing a workspace or pane through the UI (the destroySession path) leaked its anchor. Over time those stale entries could mis-resolve a ghost workspace identity. Closing now prunes the anchor immediately, in lockstep with the session teardown. (#142)

What's Changed

• fix(mcp): stop ghost workspace identity from stale pid-map entries by @openwong2kim in #142
• fix(mcp): remove the empty pane left by browser_close by @openwong2kim in #144

Full Changelog: v2.17.0...v2.17.1