feat(invariants): implement package runtime checks

packages/support/acp-snapshot/src/invariant.ts

@@ -1,14 +1,8 @@
-/**
- * Generated invariant ownership companion for `@deepseek-ai/dsh-acp-snapshot`.
- * Replace this file with package-owned checks while preserving its registration.
- *
- * @generated scripts/gen-package-invariants.ts
- * @module @deepseek-ai/dsh-acp-snapshot/invariant
- */
+/** Package-owned runtime contracts for @deepseek-ai/dsh-acp-snapshot. @module @deepseek-ai/dsh-acp-snapshot/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-acp-snapshot'
 
@@ -17,8 +11,27 @@ export const name = 'acp-snapshot-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 stable JSON-RPC correlation and volatile-value tokenization. */
+const install: InvariantInstaller = (ctx, fail) => {
+  ctx.effect(async () => {
+    const { normalizeStdout } = await import('./normalize.ts')
+    const sessionId = '12345678-1234-1234-1234-123456789abc'
+    const volatile = { sessionIds: [sessionId], cwd: '/tmp/dsh-acp-invariant' }
+    const raw = [
+      JSON.stringify({ jsonrpc: '2.0', id: 'request-7', result: { cwd: volatile.cwd } }),
+      JSON.stringify({ jsonrpc: '2.0', id: 'request-7', result: { sessionId } }),
+    ].join('\n')
+    const normalized = normalizeStdout(raw, volatile)
+    assertInvariant(fail,
+      normalized.includes('"id":1')
+        && normalized.includes('"cwd":"{{cwd}}"')
+        && normalized.includes('"sessionId":"{{sessionId}}"'),
+      'ACP normalization must preserve RPC correlation while tokenizing cwd and session ids')
+    assertInvariant(fail, normalizeStdout(normalized, volatile) === normalized,
+      'ACP stdout normalization must be idempotent')
+    return () => {}
+  }, 'acp-snapshot: validate stable transcript normalization')
+}
 
 /**
  * Register this package's invariant companion.