feat: Chess AI enhancements + AI safety improvements

Chess Engine Enhancements:
- Counter-Move Heuristic for better move ordering
- Static Exchange Evaluation (SEE) in quiescence search
- Gaussian noise difficulty scaling for more natural play
- Multi-PV analysis support
- Pondering implementation with ponder hit detection
- Opening book expansion to 90+ named openings
- Counter-move statistics tracking
- Endgame tablebases interface (ChessEndgame.ts)
- Comprehensive Chess unit tests (37 tests)

AI Agent Safety:
- Pre-flight safety check detects VS Code terminal, shows instructions, exits safely
- Signal file now includes timestamp (30s TTL) to prevent stale agent detection
- State file staleness check on startup (60s TTL) handles forced terminal closes
- Updated copilot-instructions.md with critical warning at top
- Added .vscode/settings.json with Copilot instructions
- Updated README.md and LIKU-CORE.md with AI warnings
- clearAgentSignal() called on app exit

Author: TayDa64

.github/copilot-instructions.md

@@ -1,5 +1,20 @@
 # LikuBuddy - GitHub Copilot Coding Agent Instructions
 
+## ⛔ CRITICAL: READ BEFORE ANY ACTION
+
+> **DO NOT run `npm start` or `node dist/index.js` in this terminal!**
+> 
+> This is a TUI application that will **hang your IDE** if run inline.
+> 
+> **To play games (Chess, Snake, etc.):**
+> 1. **READ FIRST:** [LIKU-CORE.md](../LIKU-CORE.md) - Required setup & launch instructions
+> 2. **THEN READ:** Game-specific docs in `docs/ai/` (e.g., `LIKU-CHESS.md`)
+> 
+> The game MUST run in a **separate terminal window**, not in VS Code's integrated terminal.
+> See LIKU-CORE.md for the correct `Start-Process` command.
+
+---
+
 ## Project Overview
 
 **LikuBuddy** is an AI-powered generative game platform and terminal companion built as a TUI (Terminal User Interface) extension for the Gemini CLI. It enables users to create games through natural language descriptions, play built-in arcade games, manage a virtual companion (Liku), and track progress through a SQLite database.

.vscode/settings.json

@@ -0,0 +1,14 @@
+{
+  "chat.instructionsFilesLocations": {
+    "**/*.md": true
+  },
+  "github.copilot.chat.codeGeneration.instructions": [
+    {
+      "text": "⚠️ DO NOT run 'npm start' or 'node dist/index.js' in this terminal! This TUI will hang the IDE. Read LIKU-CORE.md first for proper launch instructions."
+    }
+  ],
+  "github.copilot.chat.terminalChatLocation": "quickChat",
+  "files.associations": {
+    "LIKU-*.md": "markdown"
+  }
+}

LIKU-CORE.md

@@ -174,18 +174,23 @@ Register your identity before playing Chess to trigger your intro video:
 
 **Windows:**
 ```powershell
+# Signal file format: Line 1 = agent ID, Line 2 = timestamp (expires after 30s)
 New-Item -ItemType Directory -Force -Path "$env:USERPROFILE\.liku-ai" | Out-Null
-Set-Content -Path "$env:USERPROFILE\.liku-ai\current-agent.txt" -Value "claude"
+$timestamp = [DateTimeOffset]::UtcNow.ToUnixTimeMilliseconds()
+Set-Content -Path "$env:USERPROFILE\.liku-ai\current-agent.txt" -Value "claude`n$timestamp"
 ```
 
 **Linux/macOS:**
 ```bash
+# Signal file format: Line 1 = agent ID, Line 2 = timestamp (expires after 30s)
 mkdir -p ~/.liku-ai
-echo "claude" > ~/.liku-ai/current-agent.txt
+echo -e "claude\n$(date +%s%3N)" > ~/.liku-ai/current-agent.txt
 ```
 
 **Supported IDs:** `claude`, `gemini`, `chatgpt`, `grok` (and aliases like `anthropic`, `openai`, `google`, etc.)
 
+> **Note:** Signal files expire after 30 seconds to prevent stale agent detection from previous sessions.
+
 ### ⏳ Intro Video Handling (CRITICAL)
 
 When entering Chess, your intro video plays for **10 seconds**. The state file will show:

README.md

@@ -28,6 +28,19 @@
 
 ---
 
+## ⛔ FOR AI AGENTS: READ THIS FIRST
+
+> **DO NOT run `npm start` in VS Code's integrated terminal!**
+> 
+> This is a TUI that will hang your IDE. You MUST:
+> 1. **Read [LIKU-CORE.md](LIKU-CORE.md)** - Essential setup and launch instructions
+> 2. **Read game docs** in `docs/ai/` before playing any game
+> 
+> The correct way to launch is via `Start-Process` (Windows) or background process (Linux).
+> See LIKU-CORE.md for details.
+
+---
+
 ## 🎯 What is Liku-AI?
 
 Liku-AI is a **terminal-based game platform** designed for both human players and AI agents. It provides: