Inbox filtering prevents agent overwhelm

Source: tests/bdd/features/inbox.feature

Feature: Inbox filtering prevents agent overwhelm
  Each agent only sees beads labeled for their role.

  @bdd
  Scenario: 20 beads across 6 agents, each sees only their own
    Given a fresh beads environment with 6 agents
    And the following beads exist:
      | creator      | title                   | labels          |
      | main-agent   | Strategic review        | priya           |
      | main-agent   | Budget approval         | priya           |
      | priya        | Fix login bug           | forge           |
      | priya        | Refactor auth           | forge           |
      | priya        | API performance         | forge           |
      | priya        | Test coverage           | atlas           |
      | priya        | Load test plan          | atlas           |
      | priya        | Review CVE-2026         | rio             |
      | priya        | Audit dependencies      | rio             |
      | priya        | SSL cert rotation       | rio,helm        |
      | helm         | Deploy staging          | helm            |
      | helm         | Monitor alerts          | helm            |
      | helm         | Disk usage warning      | helm            |
      | atlas        | Update API docs         | atlas           |
      | atlas        | Write runbook           | atlas           |
      | main-agent   | Cross-team sync         | priya,forge,atlas|
      | priya        | Hotfix review           | forge,rio       |
      | priya        | Deploy checklist        | atlas,helm      |
      | main-agent   | Quarterly report        | priya           |
      | rio          | Incident postmortem     | rio,helm,forge  |
    Then "priya" inbox contains 4 beads
    And "forge" inbox contains 6 beads
    And "atlas" inbox contains 6 beads
    And "rio" inbox contains 5 beads
    And "helm" inbox contains 6 beads
    And "main" inbox contains 0 beads