docs/chore: add community health files (CONTRIBUTING, CoC, SECURITY, templates, CODEOWNERS)

[Amayyas]

Summary

• CONTRIBUTING.md — dev setup, local checks, Conventional Commits convention, PR process
• CODE_OF_CONDUCT.md — Contributor Covenant v2.1
• SECURITY.md — private vulnerability reporting, scoped to what's relevant (API key handling, request/response parsing, dependency vulns)
• .github/ISSUE_TEMPLATE/ — bug report + feature request (form-based), plus a config routing security reports away from public issues
• .github/PULL_REQUEST_TEMPLATE.md
• CODEOWNERS
• README links to all three policy docs

Closes #27, #28, #29, #30, #31, #32

Test plan

• bundle exec rspec — 30/30 passing (no lib/spec changes in this PR)
• YAML syntax validated for the new issue-template files
• CI green

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📥 Commits

Reviewing files that changed from the base of the PR and between c8ae45e and 2168731.

📒 Files selected for processing (9)

• .github/ISSUE_TEMPLATE/bug_report.yml
• .github/ISSUE_TEMPLATE/config.yml
• .github/ISSUE_TEMPLATE/feature_request.yml
• .github/PULL_REQUEST_TEMPLATE.md
• CODEOWNERS
• CODE_OF_CONDUCT.md
• CONTRIBUTING.md
• README.md
• SECURITY.md

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