Add initial project structure, including README, CONTRIBUTING, and documentation files

- Created .gitignore to exclude unnecessary files
- Added README.md with project description and core features
- Introduced CONTRIBUTING.md for development guidelines
- Established documentation files for architecture, quality requirements, and technical risks

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# Contributing
+
+Internal development only. PRs reviewed by @directors.
+
+## Code Standards
+
+- **Language:** TypeScript (Node.js) per ADR-001
+- **Commands:** kebab-case (`/sign-up`, not `/signup`)
+- **Events:** `on<EventName>` handler pattern
+- **DB:** snake_case table names, plural
+- **Commits:** [Conventional Commits](https://www.conventionalcommits.org/) (`feat:`, `fix:`, `chore:`, `docs:`)
+- **Env vars:** Required vars documented in `.env.example`. Never commit `.env`.
+
+## PR Process
+
+1. Branch from `main`. Name: `feat/`, `fix/`, `chore/` prefix.
+2. Lint + tests pass before push.
+3. PR description links to any related issue.
+4. At least 1 approval from @directors required.
+5. Squash-merge to `main`.
+
+## Reporting Issues
+
+Open GitHub issue with:
+
+- Steps to reproduce
+- Expected vs actual behavior
+- Bot logs (redact tokens)
+- Discord command and response if relevant
+
+## Architecture Reference
+
+See [arc42 docs](/docs/01_introduction_and_goals.md) for full architecture context.