chore(plans): mark roster-signals done (PR #189)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LFyA5poHwrhAktrnsKrUiQ

Author: themightychris

plans/roster-signals.md

@@ -1,5 +1,5 @@
 ---
-status: in-progress
+status: done
 depends: [admin-members-moderation]
 specs:
   - specs/screens/admin-members.md
@@ -10,7 +10,7 @@ specs:
   - specs/behaviors/private-storage.md
   - specs/behaviors/spam-exclusion.md
 issues: []
-pr: null
+pr: 189
 ---
 
 # Plan: roster signals — origin, GitHub reputation, Slack SSO, bounces