CLI: streamline startup paths and env parsing

Add shared parseBooleanValue()/isTruthyEnvValue() and apply across CLI, gateway, memory, and live-test flags for consistent env handling.
Introduce route-first fast paths, lazy subcommand registration, and deferred plugin loading to reduce CLI startup overhead.
Centralize config validation via ensureConfigReady() and add config caching/deferred shell env fallback for fewer IO passes.
Harden logger initialization/imports and add focused tests for argv, boolean parsing, frontmatter, and CLI subcommands.

src/browser/routes/utils.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+
+import { toBoolean } from "./utils.js";
+
+describe("toBoolean", () => {
+  it("parses yes/no and 1/0", () => {
+    expect(toBoolean("yes")).toBe(true);
+    expect(toBoolean("1")).toBe(true);
+    expect(toBoolean("no")).toBe(false);
+    expect(toBoolean("0")).toBe(false);
+  });
+
+  it("returns undefined for on/off strings", () => {
+    expect(toBoolean("on")).toBeUndefined();
+    expect(toBoolean("off")).toBeUndefined();
+  });
+
+  it("passes through boolean values", () => {
+    expect(toBoolean(true)).toBe(true);
+    expect(toBoolean(false)).toBe(false);
+  });
+});