Close DV-01–04,07,09,13,14: unify operator-deck UX in server/web.

Standardize neon cyan on #00e8f5, wire SacredPageHeader across Builds/Path Tracer/LOTL, dedupe Pages.css, align Path Tracer chrome, drop dead wealth-deck CSS, add prefers-color-scheme shell + HelpTip, sidebar version from package.json build inject, and Vitest CSS regression guards.

server/internal/api/architecture_deferred_test.go

@@ -0,0 +1,50 @@
+package api
+
+import (
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestArchitectureDeferredHonestStubs(t *testing.T) {
+	t.Run("tunnel_stream WS stub", func(t *testing.T) {
+		src, err := os.ReadFile("websocket.go")
+		if err != nil {
+			t.Fatal(err)
+		}
+		body := string(src)
+		if !strings.Contains(body, `case "tunnel_stream":`) || !strings.Contains(body, `"implemented": false`) {
+			t.Fatal("expected dashboard tunnel_stream not-implemented stub")
+		}
+	})
+
+	t.Run("WS init pagination option", func(t *testing.T) {
+		src, err := os.ReadFile("dashboard_ws_init.go")
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !strings.Contains(string(src), "init_limit") {
+			t.Fatal("expected init_limit query param parser")
+		}
+	})
+
+	t.Run("Path Tracer SQLite persistence", func(t *testing.T) {
+		src, err := os.ReadFile("pathtracer_handler.go")
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !strings.Contains(string(src), "loadPersistedSessions") {
+			t.Fatal("expected Path Tracer startup restore from SQLite")
+		}
+	})
+
+	t.Run("SQLite single-writer ceiling documented", func(t *testing.T) {
+		src, err := os.ReadFile("../db/sqlite.go")
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !strings.Contains(string(src), "SetMaxOpenConns(1)") {
+			t.Fatal("expected SQLite single-writer guard")
+		}
+	})
+}