Reuse mapping agent to attribute trackers in enricher

The enrichment worker no longer invents a description when a tracker's
purpose cannot be substantiated; it records an empty description and
marks the row enriched so the stale-recovery loop does not retry it.

Vendor identification is the mapping pipeline's job, so the enricher
reuses the existing tracker-mapping agent to attribute a third party
for an unlinked common pattern before describing it. A confident
catalog match seeds the enrichment prompt and links the pattern, but
the enricher never creates or overrides an attribution.

When a blank, unlinked catalog row later gains a third party through
the mapping pipeline's upsert, enrichment is re-armed so the now-known
vendor gets a second, better-informed description attempt.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/cookiebanner/tracker_mapping_agent.go

@@ -161,3 +161,27 @@ func buildAgentPrompt(tp coredata.TrackerPattern, domains []string) string {
 
 	return prompt
 }
+
+// buildCommonPatternIdentificationPrompt builds the mapping-agent input
+// for a global catalog pattern. Catalog rows carry no observed domains,
+// so the prompt omits the <observed_domains> signal and relies on the
+// pattern name, type, and naming conventions. It lets the enrichment
+// worker reuse the mapping agent to attribute a vendor before describing.
+func buildCommonPatternIdentificationPrompt(cp coredata.CommonTrackerPattern) string {
+	maxAge := "session"
+	if cp.MaxAgeSeconds != nil {
+		maxAge = fmt.Sprintf("%d seconds", *cp.MaxAgeSeconds)
+	}
+
+	return fmt.Sprintf(
+		"Identify the following tracker:\n\n"+
+			"<pattern> %s </pattern>\n"+
+			"<type> %s </type>\n"+
+			"<match_type> %s </match_type>\n"+
+			"<max_age> %s </max_age>\n",
+		cp.Pattern,
+		cp.TrackerType,
+		cp.MatchType,
+		maxAge,
+	)
+}