Add Copilot instructions and .gitignore

[Copilot]

Configures GitHub Copilot coding agent instructions per best practices at https://gh.io/copilot-coding-agent-tips.

Changes

• .github/copilot-instructions.md: 240-line guide covering:

  • Project structure (Rust CLI for Solana wallet management with ratatui TUI)
  • Build/test/lint processes (cargo build, cargo test, cargo fmt/clippy)
  • Security requirements for handling Solana private keys
  • CI/CD checks (build, test, coverage, clippy -D warnings, fmt)
  • Known issues:
    • Keypair::from_bytes removed in solana-sdk 3.0.0 (affects key_validator.rs:37, tui.rs:397, wallet_manager.rs:162) - migrate to Keypair::new_from_array([u8; 32]) using first 32 bytes of keypair
    • frame.size() deprecated in ratatui - use frame.area()
  • Module status: config.rs, logging.rs, transaction_handler.rs implemented but not yet imported in main.rs

• .gitignore: Standard Rust exclusions (target/, IDE files, coverage reports)

• Cleanup: Removed 2,083 committed build artifacts from target/

Example from instructions

// Migration for Keypair::from_bytes removal in solana-sdk 3.0.0
// Old (no longer available):
Keypair::from_bytes(&key_bytes)

// New (use first 32 bytes as seed):
let seed: [u8; 32] = key_bytes[0..32].try_into()?;
Keypair::new_from_array(seed)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ✨ Set up Copilot instructions #28

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

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