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docs: allow approved third-party packages
Updates dependency policy from 'stdlib only' to 'stdlib preferred,
approved packages allowed'. Adds initial approved list:

- gopkg.in/yaml.v3: YAML parsing for persona files
- github.com/google/go-cmp: Test comparisons with readable diffs

Includes process for adding new dependencies.
2026-05-10 13:43:59 -07:00

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# Conventions
## Language & Dependencies
- Target the latest stable Go release.
- Prefer Go standard library; approved third-party packages allowed (see below).
### Approved Third-Party Packages
| Package | Use Case | Notes |
|---------|----------|-------|
| `gopkg.in/yaml.v3` | YAML parsing | Persona files, config |
| `github.com/google/go-cmp` | Test comparisons | `cmp.Diff` for readable diffs |
To add a new dependency:
1. Open a PR with justification (why stdlib is insufficient)
2. Package must be well-maintained, widely used, minimal transitive deps
3. Update this table when approved
## Error Handling
- Return errors; never panic.
- Wrap errors with context using `fmt.Errorf("context: %w", err)`.
- Check all error returns.
## Testing
- Test every exported function.
- Use `net/http/httptest` for HTTP mocking.
- Table-driven tests where multiple inputs share the same assertion logic.
- Integration tests use build tags (`//go:build integration`).
## Style
- Keep functions short and focused.
- Prefer early returns over deep nesting.
- Meaningful variable names — no single-letter names outside loop indices.
- Comments explain *why*, not *what*.
## Process
- `go test ./...` must pass before commit.
- `go vet ./...` must pass before commit.
- Keep commits atomic and well-described.