v2.0.1

Runner

• Fixed a scheduler/claim lock bug where an agent run paused in waiting for
  human review still counted as in flight. waiting runs are now treated as
  idle, so the agent's other jobs can continue while the paused run waits for a
  reply. Active execution still serializes per agent: running and pending
  runs hold the lock.
• Matched workflow-job claim guards and runner pool counts to the same rule:
  waiting is not an execution slot, while scheduled, running, and
  pending still prevent duplicate workflow materialization where appropriate.

Tests and docs

• Added regression coverage for agent and workflow claim behavior around
  waiting runs.
• Updated the runner, architecture, agent, jobs/runs, PRD, and database-schema
  docs to state that waiting is idle rather than in flight.