Update mechanic authoring persistence

docs/TALENT_MECHANIC_RULES.md

@@ -79,6 +79,24 @@ meters:
   duration.
 - The wearer does not count as an ally.
 
+## Close and Personal
+
+Close and Personal uses a proximity-snapshot qualifying set:
+
+- Include each distinct allied Agent whose distance from the source Agent is
+  less than or equal to 30 meters and who has at least one buff granted by that
+  source Agent.
+- Count an ally once when several of the source Agent's buffs qualify.
+- Do not include an ally whose qualifying buffs come only from other sources.
+
+Record the resolved non-negative integer count in
+`proximity_snapshot.values.alliesWithin30MetersWithAgentGrantedBuff`. The
+calculation builder supplies it from the
+`allies-within-30m-with-agent-granted-buff` scenario input. The confirmed rule
+defines this qualifying set but does not provide Close and Personal's base
+percentage. Keep that percentage unresolved until source evidence or an author's
+clarification supplies it.
+
 ## Emergency Retreat
 
 Emergency Retreat activates whenever at least one enemy is within 20 meters and