Merge branch 'codex/simp-snapshot-fixture-inventory' into codex/simp-shared-acp-test-launcher

# Conflicts:
#	docs/rfc/implemented/testing/2026-07-08-shared-acp-snapshot-package.md
#	examples/acp-agent/tests/acp.e2e.ts
#	examples/acp-agent/tests/escalation.e2e.ts
#	packages/support/acp-snapshot/README.md
#	packages/support/acp-snapshot/src/harness.ts
#	packages/support/acp-snapshot/src/index.ts

packages/support/acp-snapshot/tests/fixtures/fake-acp-agent.ts

@@ -1,19 +1,7 @@
 /**
- * Scripted fake ACP agent bin for `dsh-acp-snapshot`'s unit specs. Speaks
- * newline-delimited JSON-RPC on stdio like the real `dsh-acp-agent` bin, but
- * every behavior — how prompts settle, whether session/new rejects, which
- * session logs get persisted, what filesystem noise to leave — comes from a
- * `behavior.json` sitting NEXT to the `$DSH_SNAPSHOT_FILE` fixture, so a spec
- * scripts a whole subprocess run from data. The specs launch it through the
- * REAL `runScenario` spawn path (tsx loader, temp cwd, env plumbing), so the
- * harness plumbing is exercised for real; only the agent behind the protocol
- * is scripted.
- *
- * The specs (not the golden tier) own this bin: it asserts nothing, echoes
- * observable facts into `session/update` text chunks (env probe, permission
- * outcome, seeded-workspace listing) for the spec to read off `rawStdout`, and
- * exits 0 on stdin EOF after writing the scripted logs — mirroring the real
- * bin's dispose-flush-exit shape.
+ * Scripted ACP agent for snapshot-kit tests. A fixture-adjacent `behavior.json` controls the
+ * subprocess reached through the real harness path; the bin reports observations over ACP and
+ * writes scripted logs before exiting on stdin EOF.
  */
 
 import { mkdirSync, readFileSync, rmSync, writeFileSync } from 'node:fs'