Comment-based conversation threads

Source: tests/bdd/features/comments.feature

Feature: Comment-based conversation threads
  Agents communicate within a bead using structured comment prefixes.

  @bdd
  Scenario: Question-answer exchange between two agents
    Given a fresh beads environment with 6 agents
    And "priya" creates a bead "Implement auth module" labeled "forge"
    And "forge" claims the bead
    When "forge" comments "QUESTION: Should we use OAuth2 or SAML?"
    And "forge" adds label "priya" to the bead
    Then the bead has 1 comment with prefix "QUESTION:"
    When "priya" comments "ANSWER: Use OAuth2, it's simpler for our use case"
    Then the bead has 2 comments total
    And the bead has 1 comment with prefix "ANSWER:"
    And comment authors are "forge,priya"