feat(invariants): implement package runtime checks

packages/support/loader-smoke/src/invariant.ts

@@ -1,14 +1,8 @@
-/**
- * Generated invariant ownership companion for `@deepseek-ai/dsh-loader-smoke`.
- * Replace this file with package-owned checks while preserving its registration.
- *
- * @generated scripts/gen-package-invariants.ts
- * @module @deepseek-ai/dsh-loader-smoke/invariant
- */
+/** Package-owned runtime contracts for @deepseek-ai/dsh-loader-smoke. @module @deepseek-ai/dsh-loader-smoke/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-loader-smoke'
 
@@ -17,8 +11,25 @@ export const name = 'loader-smoke-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 default source mode and plain-Node built-artifact launch resolution. */
+const install: InvariantInstaller = (ctx, fail) => {
+  ctx.effect(async () => {
+    const { resolveExampleLaunch, resolveExampleMode } = await import('./index.ts')
+    assertInvariant(fail, resolveExampleMode('') === 'src',
+      'an empty example-mode selection must preserve source-mode development')
+    const launch = resolveExampleLaunch({
+      srcBin: '/workspace/probe/src/bin.ts',
+      mode: 'lib',
+    })
+    assertInvariant(fail,
+      launch.command === process.execPath
+        && launch.args.length === 1
+        && launch.args[0] === '/workspace/probe/lib/bin.js'
+        && launch.env.TSX_TSCONFIG_PATH === undefined,
+      'built example launches must use plain Node, the derived lib entry, and no tsx paths map')
+    return () => {}
+  }, 'loader-smoke: validate source and built launch resolution')
+}
 
 /**
  * Register this package's invariant companion.