chore: polish docs and verify local PHP runtime checks

README.md

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+# Dino Land
+
+No-build browser game using plain **HTML/CSS/JS/PHP**.
+
+## Run locally
+
+```bash
+cd "/Users/lawsonawhittington/.openclaw/workspace/Dino Land"
+php -S localhost:8000
+```
+
+Open: http://localhost:8000
+
+## Controls
+
+- **Up Arrow**: jump
+- **Down Arrow**: duck
+- **Left Arrow**: walk backward
+- **Right Arrow**: walk forward
+
+## Gameplay Rules
+
+- TRex starts with **3 hearts**.
+- Moving forward earns score (**+1 per forward step unit**).
+- Water gaps cause instant death if landed in.
+- Ant collision costs 1 heart; jumping on ants crushes them.
+- Pterodactyls unlock after score > 100 (duck to avoid).
+- Meteors unlock after score > 250.
+- On death: top-10 leaderboard is shown; top-10 runs can be saved.
+
+## Leaderboard persistence
+
+- Backend endpoint: `api/scores.php`
+- Data file: `data/scores.json`
+
+## Quick verification checklist
+
+1. Start server and open game.
+2. Confirm score increases while moving right.
+3. Confirm hearts drop on ant / pterodactyl / meteor collisions.
+4. Confirm water causes immediate game over.
+5. Confirm leaderboard loads and score save works.