Fix append-only-comments for activation comment updates

[Copilot]

Problem

When append-only-comments: true is configured, the system still replaces previous comments instead of creating new ones. This only affects PR/issue/commit link updates during workflow execution.

Root Cause

update_activation_comment.cjs (handles PR/issue/commit links) doesn't check the append-only-comments flag, while notify_comment_error.cjs (handles run-started/success/failure) correctly implements it.

Changes

• update_activation_comment.cjs: Added append-only-comments flag check

  • When enabled: creates new comment via POST API
  • When disabled: updates existing comment via PATCH API (current behavior)
  • Supports both issues/PRs (REST) and discussions (GraphQL)
  • Graceful handling when activation comment doesn't exist

• update_activation_comment.test.cjs: Added test coverage for append-only mode

  • Updated mocks to support messages_core.cjs
  • Added 5 test cases covering both create and update paths

Configuration

safe-outputs:
  messages:
    append-only-comments: true

With this flag, all comment operations (activation updates + status messages) now create new comments rather than replacing, maintaining full audit trail for campaign tracking.

Original prompt

For campaign generator, messages with append-only-comments: true does not work. The issue still replaces the previous comment intead of creating a new one.

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[mnkiefer]

@copilot Recompile affected workflows and the campaign generator.

[Copilot]

@copilot Recompile affected workflows and the campaign generator.

Recompiled all workflows including the campaign generator. All 133 workflows compiled successfully with no changes needed to the lock files. The update_activation_comment.cjs changes are used at runtime via the actions/setup action, so the existing lock files remain valid.