feat(invariants): implement package runtime checks

packages/sdk/scripts/src/invariant.ts

@@ -1,14 +1,8 @@
-/**
- * Generated invariant ownership companion for `@deepseek-ai/dsh-scripts`.
- * Replace this file with package-owned checks while preserving its registration.
- *
- * @generated scripts/gen-package-invariants.ts
- * @module @deepseek-ai/dsh-scripts/invariant
- */
+/** Package-owned runtime contracts for @deepseek-ai/dsh-scripts. @module @deepseek-ai/dsh-scripts/invariant */
 
 /* jscpd:ignore-start */
 import type { Context } from 'cordis'
-import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+import { assertInvariant, type InvariantInstaller } from '@deepseek-ai/dsh-invariants'
 
 const PACKAGE_NAME = '@deepseek-ai/dsh-scripts'
 
@@ -17,8 +11,24 @@ export const name = 'scripts-invariant'
 /** Services required before the companion can register. */
 export const inject = ['invariants']
 
-/** Reserve this package's invariant ownership until it adds relational checks. */
-const install: InvariantInstaller = () => {}
+/** Assert the launcher's opaque post-separator forwarding boundary. */
+const install: InvariantInstaller = (ctx, fail) => {
+  ctx.effect(async () => {
+    const { splitForwardedArgs } = await import('./forwarding.ts')
+    const plain = splitForwardedArgs(['dev', 'src/index.ts'])
+    const separated = splitForwardedArgs(['dev', 'src/index.ts', '--', '--inspect', '9229'])
+    assertInvariant(fail,
+      plain.launcher.length === 2
+        && plain.forwarded.length === 0
+        && separated.launcher.length === 2
+        && separated.launcher[1] === 'src/index.ts'
+        && separated.forwarded.length === 2
+        && separated.forwarded[0] === '--inspect'
+        && separated.forwarded[1] === '9229',
+      'dsh-sdk must split the first delimiter without interpreting forwarded runtime arguments')
+    return () => {}
+  }, 'dsh-sdk: validate command argument contracts')
+}
 
 /**
  * Register this package's invariant companion.