Add playable corridor scroll desktop prototype

HANDOFF_2026-06-19.md

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+# Handoff — June 19, 2026
+
+## 📌 Summary of Progress
+In this session, we successfully built and prototyped a fully playable MVP for the **Corridor Scroll** module using the desktop launcher.
+
+1. **Environment & Build Fixes:**
+   - Installed `openjdk@17` via Homebrew and set up Java environment variables.
+   - Fixed desktop configuration in `desktop/build.gradle.kts` by adding the `:shared` dependency and passing `-XstartOnFirstThread` to resolve macOS GLFW thread restrictions.
+   - Fixed `DesktopLauncher.kt` to instantiate the new `GameHost(ModuleType.LINE_CORRIDOR)` setup.
+2. **Gameplay Improvements (Corridor Scroll):**
+   - Transformed the static horizontal prototype into a vertical wiggling corridor scrolling from bottom to top.
+   - Slower scroll speed (`100f` px/s) to make drawing manageable.
+   - Implemented an organic, unpredictable centerline using composite waves (a slow left-to-right drift combined with faster wiggles).
+   - Designed a dynamic corridor width that swells up to 2x and pinches down to 0.5x of its base width as it scrolls.
+3. **Inputs & Feedback Loop:**
+   - Added standard desktop mouse/touch drag fallback inside `LineCorridorScreen.kt` so the game is testable directly on macOS without an emulator.
+   - Built a 15-second timer per session.
+   - Programmed real-time scoring metrics:
+     - **Containment:** % of drawn points staying within the boundaries.
+     - **Fill:** Shading coverage between boundaries (calculated vertically in bins, normalized by the dynamic width of each bin).
+     - **Overall:** Weighted combination.
+   - Added end-game screens displaying scores and a restart prompt (SPACE/TAP to replay).
+
+---
+
+## 🛠️ Current State
+* The desktop application compiles and runs successfully using:
+  ```bash
+  export JAVA_HOME="$(brew --prefix openjdk@17)/libexec/openjdk.jdk/Contents/Home"
+  ./gradlew :desktop:run
+  ```
+* Gameplay is interactive, responsive, and wiggles/pinches behave as expected.
+
+---
+
+## 📋 Next Steps & Feature Backlog
+1. **Pretentious Art Critique Commentary ("The Gallery Critique"):**
+   - We drafted a feature proposal in `proposal_commentary.md`. 
+   - Next session can implement `ArtArchetype` in the `:shared` module and load corresponding art snob quotes (e.g., from *Dr. Alistair Vance* or *Madame Genevieve*) depending on whether the player was too safe (high containment, low fill) or too messy (low containment, high fill).
+2. **Android & Stylus Integration:**
+   - Test the Android target and hook up actual S-Pen data (pressure/tilt) via `MotionEvent` APIs to make sure it handles S-Pen pressure.
+3. **Additional Modules:**
+   - Begin development of Phase 2 modules like the **Pressure Ramp** (matching target pressure curves).