feat(skills): configure CLAUDE.md and Claude Code skills

[robert197]

Summary

• CLAUDE.md was already comprehensive from prior work (project overview, tech stack, commands, conventions, testing, workflows, design context)
• All required Claude Code skills already existed: new-django-app, new-model, new-view, inspect-flow
• Added missing estimation-framework skill with RICE scoring adapted for BAKY
• .claude/settings.json already configured with appropriate permissions

Issue

Closes #2

Testing

• make lint passes
• make test runs (no test files yet, exit code 5 = no tests collected)
• All skills are loadable via /skill-name

Acceptance Criteria

• CLAUDE.md accurately describes project setup and conventions
• Skills are tested and produce correct scaffolding
• New developer (Claude Code session) can be productive within minutes

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Co-Authored-By: Claude noreply@anthropic.com