feat: add contribution readiness assistant

[arnabnandy7]

Summary

Adds a contribution-readiness assistant that helps contributors evaluate issues before investing time.

Closes #54.

Changes

• Retrieves cached GitHub community-profile metadata for a bounded set of repositories.
• Evaluates repository documentation, activity, maintainer responsiveness, assignment state, discussion signals, and linked pull requests.
• Classifies issues as:
  • Ready to start
  • Ask before starting
  • Possibly claimed
  • Poorly documented
  • Repository inactive
  • Readiness unknown
• Displays a readiness badge and expandable checklist on issue cards.
• Links directly to available contribution documentation.
• Adds a URL-backed and saved-search-backed Ready to start filter.
• Reuses readiness in personalized recommendations and weekly digests.
• Returns an unknown state when community metadata is unavailable.
• Updates the architecture, setup, contribution, and project documentation.
• Removes the obsolete SQL migration files now represented by the architecture documentation.

Database changes

Adds the following field to saved_search:

readiness TEXT NOT NULL DEFAULT 'any'

The schema change has been applied to both preview and production databases. Existing saved searches default to unrestricted readiness.

GitHub API usage

• Community-profile requests are limited to 12 repositories per search.
• Responses are cached for six hours.
• Optional enrichment failures do not prevent issue discovery.
• Ready-only searches exclude issues with linked pull requests through GitHub’s search qualifier.

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Project	Deployment	Actions	Updated
openissue-dev	Ready	Preview	Sep 1, 2026 3:20pm UTC

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
93.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud