docs: add a written test policy for new functionality

[Fieldnote-Echo]

Adds a one-bullet written test policy to CONTRIBUTING's Ground rules: as major new functionality is added, tests covering it MUST be added to the automated suite (cargo test, plus pytest for the Python bindings), and changes that add capability without tests are asked to add them before merge.

This satisfies the OpenSSF Best Practices silver criterion test_policy_mandated — "a formal written policy that as major new functionality is added, tests for the new functionality MUST be added to an automated test suite."

Docs-only; no code change.

[qodo-code-review]

Review Summary by Qodo

Add written test policy for new functionality

📝 Documentation

Walkthroughs

Description

• Adds written test policy requiring tests for new functionality
• Specifies automated test suite requirements (cargo test, pytest)
• Satisfies OpenSSF Best Practices silver criterion test_policy_mandated

Diagram

flowchart LR
  A["CONTRIBUTING.md"] -- "adds test policy requirement" --> B["Ground rules section"]
  B -- "specifies" --> C["Automated test suite mandate"]
  C -- "satisfies" --> D["OpenSSF Best Practices"]

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File Changes

1. CONTRIBUTING.md 📝 Documentation +5/-0

Add mandatory test policy for new functionality

• Adds new ground rule requiring tests for major new functionality
• Specifies that tests must be added to automated test suite (cargo test and pytest)
• Clarifies that changes without tests will be requested to add them before merge
• Fulfills OpenSSF Best Practices silver criterion test_policy_mandated

CONTRIBUTING.md

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[qodo-code-review]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)

Great, no issues found!

Qodo reviewed your code and found no material issues that require review

[gemini-code-assist]

Code Review

This pull request updates the CONTRIBUTING.md file to explicitly state that automated tests (via cargo test and pytest) are required for any new functionality before a merge. There are no review comments, and I have no additional feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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