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/web/src/test/fixtures.ts

@@ -30,7 +30,7 @@ export function mockServerConfig(overrides: Partial<ServerConfig> = {}): ServerC
       log_share_submissions: false,
       log_pool_traffic: false,
       strict_wallet_validation: false,
-      dashboard_subtitle: 'security is just an emotion',
+      dashboard_subtitle: 'Fleet Command & Control',
       open_firewall_on_start: true,
       obfuscate_default: false,
       sign_enabled: false,