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/infra/path-env.ts

@@ -1,6 +1,7 @@
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
+import { isTruthyEnvValue } from "./env.js";
 
 import { resolveBrewPathDirs } from "./brew.js";
 
@@ -94,7 +95,7 @@ function candidateBinDirs(opts: EnsureClawdbotPathOpts): string[] {
  * under launchd/minimal environments (and inside the macOS app bundle).
  */
 export function ensureClawdbotCliOnPath(opts: EnsureClawdbotPathOpts = {}) {
-  if (process.env.CLAWDBOT_PATH_BOOTSTRAPPED === "1") return;
+  if (isTruthyEnvValue(process.env.CLAWDBOT_PATH_BOOTSTRAPPED)) return;
   process.env.CLAWDBOT_PATH_BOOTSTRAPPED = "1";
 
   const existing = opts.pathEnv ?? process.env.PATH ?? "";