Fixes#78159.
- Add `windowsHide: true` to the login-shell env probe used by shell-env fallback on Windows.
- Cover the fallback and trusted-shell paths with focused tests.
- Add the changelog attribution for #78266.
Verification:
- `pnpm vitest run src/infra/shell-env.test.ts`
- `pnpm build`
- `pnpm check`
- Full GitHub CI green at `deb6ffbd3c203fc52f5b320fe5ca5aafa11ade57`.
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.
