fix(db): add LIMITs to unbounded queries in fetchEvolutionMeta and fetchLineage

- Add LIMIT 100 to island populations query (fetchEvolutionMeta)
- Add LIMIT 10000 to lineage programs query (fetchLineage)

These queries had no row limits, causing OOMKill when the programs table
grew large. The pod crashed silently after "Copied web assets" because
Go panics and OOMKills exit without logging to slog.

Fixes acb-index-builder CrashLoopBackOff (4700+ restarts, 45 days).

cmd/acb-index-builder/db.go

@@ -1111,7 +1111,7 @@ func fetchEvolutionMeta(ctx context.Context, db *sql.DB) (*EvolutionMeta, error)
 	// Fetch island populations
 	meta.IslandPopulations = make(map[string]int)
 	islandRows, err := db.QueryContext(ctx, `
-		SELECT island, COUNT(*) FROM programs GROUP BY island
+		SELECT island, COUNT(*) FROM programs GROUP BY island LIMIT 100
 	`)
 	if err == nil {
 		for islandRows.Next() {
@@ -1182,6 +1182,7 @@ func fetchLineage(ctx context.Context, db *sql.DB) ([]LineageNode, error) {
 		SELECT id, parent_ids, generation, island, fitness, promoted, language, created_at
 		FROM programs
 		ORDER BY generation ASC, id ASC
+		LIMIT 10000
 	`
 
 	rows, err := db.QueryContext(ctx, query)