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/cli/program/build-program.ts

@@ -16,6 +16,7 @@ import { registerSubCliCommands } from "./register.subclis.js";
 export function buildProgram() {
   const program = new Command();
   const ctx = createProgramContext();
+  const argv = process.argv;
 
   configureProgramHelp(program, ctx);
   registerPreActionHooks(program, ctx.programVersion);
@@ -29,7 +30,7 @@ export function buildProgram() {
   registerAgentCommands(program, {
     agentChannelOptions: ctx.agentChannelOptions,
   });
-  registerSubCliCommands(program);
+  registerSubCliCommands(program, argv);
   registerStatusHealthSessionsCommands(program);
   registerBrowserCli(program);