[Repo Health] documentation: FTR fixes

[stuckvgn]

Summary

• Adds CONTRIBUTING.md — the repo had no contributor guide, leaving content standards, file naming, writing style, and PR workflow undocumented

What was added

CONTRIBUTING.md covers:

• What content belongs in this repo (docs, examples, integration guides) and what does not (application code, duplicated content)
• Directory structure reference
• File naming conventions (lowercase-hyphenated)
• Writing style guidelines: plain prose, self-contained sections, copy-pasteable examples
• Advocacy language requirements with movement terminology and a link to the no-animal-violence guide
• API/service documentation standards (auth via env vars, minimal examples before advanced usage, no hardcoded credentials)
• PR guidelines: one topic per PR, under 200 lines, run language check locally before pushing
• Quality gate: desloppify minimum score of 85

What was not added

• Dockerfile — this is a pure docs repo with no runnable code; a Dockerfile would be inappropriate
• LICENSE — already present (MIT, Open Paws, 2025)

Test plan

• CONTRIBUTING.md renders correctly on GitHub
• All links in CONTRIBUTING.md resolve (no-animal-violence, desloppify)
• Language check passes: semgrep --config semgrep-no-animal-violence.yaml CONTRIBUTING.md

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 168d00b7-6c83-468b-85ae-cc180f62978d

📥 Commits

Reviewing files that changed from the base of the PR and between fb8158e and d502eb7.

📒 Files selected for processing (4)

• .gitignore
• .pre-commit-config.yaml
• CLAUDE.md
• CONTRIBUTING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch health/ftr/documentation

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