diff --git a/MAP.md b/MAP.md
index 0217e32..067b9b8 100644
--- a/MAP.md
+++ b/MAP.md
@@ -69,8 +69,14 @@ anchor + locked decisions) and the `docs/specs/*-spec.md` set.
   prototype), `rng.ts` (seeded).
 - `manifold/src/settings/` — `settings-store.ts` (monochrome icons, input-map shape, corner radius).
 - `manifold/src/serial/` — `memlnaut-serial.ts` Web Serial scaffold + `EditorPanel.tsx` (MEMLNaut Editor mode).
-- `manifold/src/debug/probe.ts` — `window.__nisps` (`?debug=1`). `manifold/tests/e2e/smoke.spec.ts`. E2E on the
-  VPS runs via non-snap node (see BUILD-PLAN). `manifold/osc-bridge/` — Deno WS↔UDP-OSC bridge.
+- `manifold/src/engine/exploration.ts` (+ `jolt.ts`, `ou-explore.ts`) — Jolt press + OU explore gestures
+  (Learning drawer). Interim TS math from the retired playground via get/set-weights + the spine's
+  `setOutputMorph` hook; marked `P3 SWAP POINT` for the WASM bindings.
+- `manifold/src/debug/probe.ts` — `window.__nisps` (`?debug=1`). `manifold/tests/e2e/` — `smoke`,
+  `probe-api` (15-test engine-contract port), `spine` (spine invariant + probe-survives-mode-switch).
+  E2E on the VPS runs via non-snap node (see BUILD-PLAN). `manifold/tests/fixtures/` — golden parity
+  fixtures (gesture trace, curves, input/output pipelines) captured 2026-07-13 pre-P4, guarded by
+  `tests/pipeline-golden.test.ts` (in `bun run test`). `manifold/osc-bridge/` — Deno WS↔UDP-OSC bridge.
 
 ### `vcv/` — VCV Rack 2 plugin (MEMLNaut module, WIP)
 Native C++ Rack module: ML CV-mapper with RL feedback + a browser bridge. Currently 2→12 (being evolved to
diff --git a/docs/specs/plans/one-core-engine-refactor.md b/docs/specs/plans/one-core-engine-refactor.md
index 8bbbd4e..c1b28a8 100644
--- a/docs/specs/plans/one-core-engine-refactor.md
+++ b/docs/specs/plans/one-core-engine-refactor.md
@@ -82,15 +82,22 @@ Each phase ends green on its test gate and is independently landable. File phase
 - ✅ `ml-debug.log`/`graphify-out/` were already absent from the tree; `.claude/worktrees/` gitignored.
 - **Gate met:** `run-all-tests.sh` green (Playwright leg via the BUILD-PLAN non-snap-node VPS runner); parity PASS reading `manifold/public/` (max delta 2.4e-7); manifold typecheck+build green against the freshly-built artifact.
 
-### P1 — Retire playground, single TS home (≈1 day)
+### P1 — Retire playground, single TS home (≈1 day) — ✅ landed 2026-07-13
 
-- Branch `archive/playground-solidjs` at current main; delete `playground/` from main.
-- Manifold's `src/engine/` is now the only TS spine. Port the two playground-only exploration UIs that
-  manifold lacks (Jolt press gesture, OU explore control) as *UI shells only* — their math arrives in P3;
-  interim they may call the existing `nisps_ml_get/set_weights` route the playground used.
-- Move Playwright specs worth keeping (spine invariant, probe API) into `manifold/tests/`.
-- Retarget every script/doc reference (`CLAUDE.md`, `MAP.md`, deploy script) from playground to manifold.
-- **Gate:** chokepoint E equivalent — full test script green with playground gone; manifold e2e passes.
+- ✅ Branch `archive/playground-solidjs` + tag `playground-solidjs-final`; `playground/` deleted from main.
+  Parity fixtures for P4 captured FIRST: `manifold/tests/fixtures/` (288-event gesture trace, curve
+  goldens, input/output pipeline goldens under 14+8 configs) + drift-guard `pipeline-golden.test.ts`.
+  Note: input pipeline's momentum path reads `performance.now()` — fixtures pin a clock contract (see
+  fixtures README). C15 (stub + c15.wasm) now lives only on the archive branch (ALIGNMENT defect #1).
+- ✅ Jolt press + OU explore UI shells in the Learning drawer; interim TS math via get/set_weights in
+  `manifold/src/engine/{exploration,jolt,ou-explore}.ts`, marked `P3 SWAP POINT`.
+- ✅ Keeper Playwright specs ported: `probe-api.spec.ts` (15 tests), `spine.spec.ts` (4). Playground UI/
+  persistence specs dropped with the playground.
+- ✅ References retargeted: run-all-tests stage 5 → manifold, ci.yml manifold-tests job, osc-bridge.yml
+  (was already broken), codegen TS target removed (returns P5), AGENTS/README/MAP/ALIGNMENT/
+  AGENT-REFERENCE/specs-MAIN. The VPS deploy webhook already built only manifold — no change needed.
+- **Gate met:** full `run-all-tests.sh` green with playground gone (ctest 4/4, parity PASS, lint clean,
+  manifold 9 unit + 20 e2e).
 
 ### P2 — Storage-policy split: templated hardware, dynamic browser (the structural centre, ≈1 wk)
 
diff --git a/manifold/ONBOARDING.md b/manifold/ONBOARDING.md
index 81af17c..658d513 100644
--- a/manifold/ONBOARDING.md
+++ b/manifold/ONBOARDING.md
@@ -179,6 +179,11 @@ a setting → `--r-*` tokens.
 - `dataset.ts` — JS-side example store + sample-weight modes (uniform/recency/spatial/combined).
 - `curves.ts` — math primitives. **Must stay lockstep with C++ `nisps/core/math.hpp`** (golden tests
   compare WASM vs TS). `sink.ts` — `EngineSink` framework boundary. `types.ts` — C-ABI surface types.
+- `exploration.ts` — `ExplorationController` adapter for the Jolt press + OU explore gestures
+  (Learning drawer). Interim TS math in `jolt.ts` / `ou-explore.ts` (ported from the retired
+  playground), driven via get/set-weights; OU applies through the spine's inert-by-default
+  `setOutputMorph` hook. The `─── P3 SWAP POINT ───` comment marks where the one-core-engine plan
+  swaps these for `nisps_ml_jolt_press/release` + `nisps_ml_explore_intensity` WASM bindings.
 
 ### Inputs — `src/inputs/`
 - `input-layer.ts` — composition hub. One rAF loop polls sources, pulls all axes into a vector,
diff --git a/manifold/package.json b/manifold/package.json
index 23a0667..524fb90 100644
--- a/manifold/package.json
+++ b/manifold/package.json
@@ -9,7 +9,7 @@
     "build": "tsc --noEmit && vite build",
     "preview": "vite preview --port 4273",
     "typecheck": "tsc --noEmit",
-    "test": "bun test src",
+    "test": "bun test src tests/pipeline-golden.test.ts",
     "test:e2e": "playwright test",
     "test:e2e:headed": "playwright test --headed"
   },