Add Copilot instructions for repository

[Copilot]

Configures GitHub Copilot coding agent with repository-specific context and conventions per best practices.

Changes

Created .github/copilot-instructions.md with:

• Project context: P2P graph database with SQLite compatibility, Rust-first monorepo with TypeScript/Deno bindings
• Tech stack details: Rust workspace (crates/), Deno primary runtime, Node.js compatibility layer, Svelte web UI
• Coding standards:
  • TypeScript: Prettier (100 width) for Node.js, deno fmt (80 width) for Deno
  • Rust: edition 2021, anyhow/thiserror for errors, tokio async runtime
  • Security: input sanitization, no prototype pollution, AGPL v3 compliance
• Architecture: Core Rust engine → TypeScript bindings → REST/WebSocket APIs, P2P via libp2p with ed25519/AES-GCM
• Build/test workflows: npm run verify (TypeScript + Deno tests), cargo test --workspace, separate test suites for unit/integration/security/performance
• Contribution flow: Conventional commits, automated releases via CI, Windows requires libclang setup for Rust
• Common tasks: Adding features (TDD, Rust core first), fixing bugs, updating deps, VSCode extension patterns

Note: legacy/ directory contains TypeScript being migrated to Rust - paths may change.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gh.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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 #31

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.