Improve CI and docs

[soumendrak]

Summary

• run lint and security checks on pull requests
• show lint status badge and mention test coverage minimum
• add contributing guidelines with lint, tests, and bandit instructions

Testing

• uv run pytest -q

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https://chatgpt.com/codex/tasks/task_e_685ffe356c48832e8d833d58c4dc36c4

[cloudflare-workers-and-pages]

Deploying openodia with    Cloudflare Pages

Latest commit:	7ddce94
Status:	🚫  Build failed.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.49%. Comparing base (ac2db15) to head (7ddce94).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #184   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files           9        9           
  Lines         199      199           
=======================================
  Hits          198      198           
  Misses          1        1           

Flag	Coverage Δ
pytest	99.49% <ø> (ø)

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[Copilot]

Pull Request Overview

This PR enhances the project's continuous integration and documentation by adding lint and security checks, enforcing test coverage, and providing clear contribution guidelines.

• Add lint status badge and coverage requirement note to README
• Create CONTRIBUTING.md with development setup, lint, security scan, and PR instructions
• Update CI workflow to run on pull requests and include test execution

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
README.md	Added lint badge and noted minimum 70% test coverage requirement
CONTRIBUTING.md	Introduced contributing guidelines covering setup, lint, tests, and Bandit
.github/workflows/codequality.yml	Configured workflow to trigger on PRs and run tests

Comments suppressed due to low confidence (3)

CONTRIBUTING.md:1

• [nitpick] The initial bullet list appears to be placeholder text that predates the new contributing structure; consider removing or merging it under the '# Contributing' header to avoid duplication.

# Contributing

CONTRIBUTING.md:7

• [nitpick] The reference to installing 'uv' may be unclear to new contributors; consider adding a brief note or link explaining what 'uv' is or why it's required.

1. Install project dependencies using `uv`:

.github/workflows/codequality.yml:74

• While tests are run, there's no enforcement of the 70% coverage threshold mentioned elsewhere. Consider adding coverage flags (e.g., pytest --cov --cov-fail-under=70) or a separate step to fail if coverage drops below the minimum.

        uv run pytest -v