Label-based message routing

Source: tests/bdd/features/routing.feature

Feature: Label-based message routing
  Agents communicate through labeled beads.
  The watcher routes each bead to the agent mapped to its label.

  @bdd
  Scenario: Single-label bead appears in correct agent's inbox
    Given a fresh beads environment with 6 agents
    When "forge" creates a bead "Review my PR" labeled "priya"
    Then "priya" inbox contains 1 bead titled "Review my PR"
    And "forge" inbox contains 0 beads
    And "atlas" inbox contains 0 beads

  @bdd
  Scenario: Multi-label bead appears in multiple inboxes
    Given a fresh beads environment with 6 agents
    When "priya" creates a bead "Security + infra review needed" labeled "forge,rio,helm"
    Then "forge" inbox contains 1 bead
    And "rio" inbox contains 1 bead
    And "helm" inbox contains 1 bead
    And "atlas" inbox contains 0 beads
    And "priya" inbox contains 0 beads