Final sweep: Crucible fixes, Path Tracer polish, forge progress, tests green.

Align dashboard subtitle default and UpsertAgent tests with fleet label behavior; WebSocket coalesce and PathForge hardening; Crucible expanded ops and visual DV fixes; Vitest 610/610 and full test-suite pass; trim PROBLEMS.md to open items only.

server/internal/db/sqlite.go

@@ -199,7 +199,7 @@ func (d *Database) UpsertAgent(a *models.Agent) error {
 	query := `INSERT INTO agents (id, name, wallet, ip, version, status, cpu_cores, memory_gb, last_seen, created_at, platform, arch, os_version, hostname, mac_address, build_id, worker_name, usb_spread, campaign)
 		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, COALESCE((SELECT created_at FROM agents WHERE id = ?), CURRENT_TIMESTAMP), ?, ?, ?, ?, ?, ?, ?, ?, ?)
 		ON CONFLICT(id) DO UPDATE SET
-			name = excluded.name,
+			name = CASE WHEN agents.name != '' AND agents.name != agents.hostname THEN agents.name ELSE excluded.name END,
 			wallet = excluded.wallet,
 			ip = excluded.ip,
 			version = excluded.version,