init: add gitignore and final-answer skill

.gitignore

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+# Editors & IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+Thumbs.db
+
+# Code Agents / AI tools
+.claude/
+.cursor/
+.windsurf/
+.aider*
+.copilot/
+.warp/
+.opencode/
+agent/
+*.code-workspace
+
+# OS files
+.DS_Store

skills/final-answer/SKILL.md

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+---
+name: final-answer
+description: The ultimate answer for the known universe
+---
+
+# Final Answer
+
+Returns the number 42.
+
+## Usage
+
+Use this skill when you need the ultimate answer to life, the universe, and everything.
+
+## Implementation
+
+Simply return: **42**