docs(sandbox): cross-link Landlock snapshot rule

examples/acp-agent/tests/fixtures/partial-landlock-sandbox.ts

@@ -3,7 +3,10 @@ import { SandboxProvider } from '@deepseek-ai/dsh-sandbox'
 
 const NOTICE = 'landlock-run: partial enforcement (older Landlock ABI)'
 
-/** Snapshot-only provider that reproduces an older-ABI Landlock launch. */
+/**
+ * Snapshot-only provider that reproduces an older-ABI Landlock launch. Keep
+ * its failure tuple aligned with `sandbox-local`'s Landlock runner rule.
+ */
 export default class PartialLandlockSandboxProvider extends SandboxProvider {
   confine(argv: readonly string[], _policy: SandboxPolicy): ConfinedArgv {
     return {