fix: filter source=live in edge functions (Codex review fix #5)

- community-benchmarks: add .eq("source", "live") to telemetry_events query
- community-pulse: use distinct install_fingerprint count instead of raw
  count, add source=live filter to all queries

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supabase/functions/community-benchmarks/index.ts

@@ -21,6 +21,7 @@ Deno.serve(async () => {
       .from("telemetry_events")
       .select("skill, duration_s, outcome")
       .eq("event_type", "skill_run")
+      .eq("source", "live")
       .not("duration_s", "is", null)
       .not("skill", "is", null)
       .gte("event_timestamp", thirtyDaysAgo)