feat(cmdline): hand the launcher's remaining arguments to the app it boots

A launcher provides three values before the tree mounts: ctx.cmdlineArgs
(get() is the whole interface) carrying everything after its own flags,
ctx.appExit for a bounded exit, and ctx.appPatches for decisions a later
recomposition must keep. An app's startup row injects cmdlineArgs and calls
runStartup() with its own commander program.

Rows the app configures inject its startup service, so they wait until the
startup row has resolved their values and provided it; --help prints,
disables those rows, and exits without the app ever starting.

A changed row is recycled — disabled, then re-enabled with its new values —
because a row's config is resolved when the Loader creates its fiber, while
the row is still waiting. Recycling never touches inject: an inject update
restarts the row from its unwrapped callback and loses the plugin's own
static injections. A mount still in flight is allowed to settle first, so
the disable has a fiber to dispose instead of racing one into existence.

scripts/check-workspace-constraints.ts

@@ -165,6 +165,9 @@ function expectedDshPackageFiles(manifest: PackageManifest): readonly string[] {
     ...exportDefault(manifest, './loader') === './lib/loader.js' ? ['lib/loader.js'] : [],
     // web-react's store subpath ships its own bundle (single-entry builds; no shared chunk).
     ...exportDefault(manifest, './store') === './lib/store/index.js' ? ['lib/store/index.js'] : [],
+    // A surface bundle's startup row is its own bundle: the Loader imports it
+    // as a row module, so it cannot ride inside the package entry.
+    ...exportDefault(manifest, './startup') === './lib/startup.js' ? ['lib/startup.js'] : [],
     ...extras,
     // Subpaths whose runtime default is the tsc-emitted tree (lib/types/*.js —
     // browser-safe source channels rehomed off src so plain Node can import