feat(ui): a Claude-Desktop-style home for every workspace
/workspace?lane=<id> opens on the workspace's home (WorkspaceHome): a prompt box whose Start opens a new session in the first free pane slot, Recents (a live session attaches its pane, any other opens its transcript, nothing resumes), and Instructions / Memory / Context / Folder. Instructions live in lanes.instructions, extra folders and uploaded files in the new lane_sources table (copies under <data dir>/workspace-context/<lane id>/); spawnRun reads them from the lane's rows and hands Claude --add-dir + an appended system prompt file, Codex --add-dir + developer_instructions. Memory is read-only. Every dashboard pane carries AGENTHUB_RUN_ID; hooks forward it and the run records which session the pane holds (a Claude pane follows /clear and /resume but not a nested claude -p), so the sidebar and notifications open the right pane (&run=). Settings loses its Projects group; Worktrees now decides which worktrees Add folder suggests.
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