feat(invariants): implement package runtime checks

packages/hooks/hooks-codex/tests/invariant.spec.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import type { BashExecutor } from '@deepseek-ai/dsh-bash'
+
+describe('Codex hook package invariant', () => {
+  it('rejects a partially installed hook listener set', async () => {
+    const ctx = new Context()
+    await ctx.plugin({
+      name: 'codex-invariant-bash',
+      apply(child: Context) {
+        child.provide('bash', {
+          resolve() {},
+          async run() {},
+          start() {},
+        } as unknown as BashExecutor)
+      },
+    })
+    await expect(ctx.plugin({
+      name: 'hooks-codex',
+      inject: ['bash'],
+      apply(child: Context) {
+        child.effect(() => () => {}, 'ctx.on("agent/session-start")')
+      },
+    })).rejects.toThrow(/must install its complete listener set atomically/)
+  })
+})