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/gateway/server-browser.ts

@@ -1,9 +1,11 @@
+import { isTruthyEnvValue } from "../infra/env.js";
+
 export type BrowserControlServer = {
   stop: () => Promise<void>;
 };
 
 export async function startBrowserControlServerIfEnabled(): Promise<BrowserControlServer | null> {
-  if (process.env.CLAWDBOT_SKIP_BROWSER_CONTROL_SERVER === "1") return null;
+  if (isTruthyEnvValue(process.env.CLAWDBOT_SKIP_BROWSER_CONTROL_SERVER)) return null;
   // Lazy import: keeps startup fast, but still bundles for the embedded
   // gateway (bun --compile) via the static specifier path.
   const override = process.env.CLAWDBOT_BROWSER_CONTROL_MODULE?.trim();