Groundwork for user-defined columns and workflow per board (#54818).
- hermes_cli/kanban_workflow.py: Column/Workflow + DEFAULT_WORKFLOW, today's
board written down as data (column order, traits, default kernel-event
edges, manual move allow-list). Not consulted by the kernel yet.
- VALID_STATUSES, dashboard BOARD_COLUMNS, the kanban_list status enum and
CLI status icons now derive from it. Fixes drift: the tool enum lacked
scheduled/review; CLI icons lacked triage/review.
- GET /workflow on the dashboard plugin API.
- Tests pin DEFAULT_WORKFLOW to real behavior: every default event edge vs.
its kernel verb, and all 64 PATCH src->dst moves vs. can_move.
96db175da7