Tasks gain an optional id field (short slug like "impl-1", "docs-arch").
Claims gain an optional task_id field referencing a specific task. The
state brief shows (id: X) on tasks and (task: X) on claims, making it
precise which task a claim covers.
Skill pack v1.9 teaches the recheck pattern: after creating a claim,
re-read state to detect if another agent claimed the same task_id in
the race window. If collision detected, abandon and pivot.
This solves the near-simultaneous start problem from the autonomy
validation where both agents picked [docs] because claims had no
task-level identity.
Tasks in checkpoints evolve from flat strings to objects with optional
intent_hint (implement/review/investigate/docs/test), blocked_by
(dependency label), and status (open/done). Agents reading the state
brief can now self-select complementary work by matching task intents
against active claim intent_types — no founder routing needed.
Backward-compatible: old string tasks normalize at render time. No
schema migration. JSONB handles both shapes. Skill pack v1.7 teaches
the autonomous selection reflex.
