docs(adr-0011): point B.3 at new issue #99

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/adr/0011-user-profile-features.md

@@ -72,6 +72,8 @@ Initial features: `completion_rate_30d`, `dismiss_rate_30d`,
   per feature across eligible users).
 - ⏳ **B.3** — Extend the bandit feature vector to include profile features
   (deliberate `D` change with state-migration plan + shadow rollout per ADR-0002).
+  Tracked separately as #99 since it's a multi-step initiative, not an
+  incremental phase.
 
 ## Alternatives considered