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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - The runner needs repeatable tests at the provider and control-plane boundaries > - Network services and live providers cannot produce deterministic conformance results > - Small in-memory adapters can exercise the same public contracts without production side effects > - This pull request adds a deterministic harness driver, control-plane adapter, and fixture runner > - It exposes these helpers only from the testing entry point > - The benefit is stable cross-boundary verification for later runtime changes ## Linked Issues or Issue Description **Subsystem affected** packages/paperclip-runner testing and conformance support **Problem or motivation** The public runner contracts have unit tests, but later provider and server slices need a deterministic way to exercise session, event, replay, checkpoint, and result behavior together. **Proposed solution** Add in-memory implementations of the harness-driver and control-plane ports. Add a canonical conformance fixture and runner. Export these utilities only from `@paperclipai/paperclip-runner/testing`. **Alternatives considered** The tests could start a real provider or server. That would make the conformance gate slower, less portable, and dependent on credentials or network state. **Roadmap alignment** This supports the existing experimental Paperclip Runner rollout. It does not enable a production adapter or change current app execution. ## What Changed - Add a deterministic harness-driver implementation. - Add an in-memory control-plane adapter with replay and checkpoint support. - Add a canonical provider-neutral conformance fixture. - Add a reusable conformance runner and contract tests. - Export the helpers from the package testing entry point only. ## Verification - `pnpm --filter @paperclipai/paperclip-runner test:typescript` - `pnpm --filter @paperclipai/paperclip-runner typecheck:typescript` - `pnpm -r typecheck` - `pnpm build` - The branch changes 10 files relative to its declared base. ## Risks Low risk. This pull request adds test-only adapters and conformance helpers. It does not select a runtime or change production behavior. Contract tests verify event identity, replay, checkpoints, and deterministic results. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used OpenAI Codex, `gpt-5`, with agentic reasoning, tool use, and code execution. ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either linked an existing public issue or described the issue in-PR - [x] I have not referenced internal or instance-local Paperclip issues or links - [x] My branch name describes the change and contains no internal Paperclip ticket id - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [ ] All Paperclip CI gates are green - [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge