External-machine validation found GET /api/v5/current 500s on a real
project: a structured task can carry `blocked_by` as a list of dependency
labels, but CurrentTask.blocked_by is typed Optional[str], so constructing
the model raised a Pydantic ValidationError.
Add a field validator that normalizes `blocked_by` — string, list, or null —
to a single display string. The API contract is unchanged (blocked_by stays
a string), so the CLI and the Project Current State UI panel, which both
read this endpoint, need no change. Adds a regression test.
Add GET /api/v5/current/spaces/{id} — a packaged, computed-on-demand
snapshot of where a space is right now: current direction, counts,
attention signals (open questions, divergence, active work), active
work claims, open tasks grouped by intent, recent milestones, and
recent activity. Shared payload contract with the smriti current CLI
surface built in parallel.
Render it as the ProjectCurrentState panel at the top of LineagePage,
replacing the hand-rolled current-state summary. Extract a shared
_get_active_claims helper so the state and current endpoints report
active work identically. No schema changes.
