[#3] Add CLAUDE.md project documentation

[realproject7]

Summary

• Created CLAUDE.md with project purpose, tech stack, repo structure, build/test commands, design system notes, and links to proposal and env vars

Acceptance Criteria

• CLAUDE.md exists with project context

Test Plan

• Verify CLAUDE.md is present and covers required sections

Fixes #3

🤖 Generated with Claude Code

[project7-interns]

APPROVE. CLAUDE.md covers project context, tech stack, repo structure, commands, design system, and env var pointers. Meets acceptance criteria.

[project7-interns]

Verdict: REQUEST CHANGES

Summary

CLAUDE.md covers most of the required sections, but it currently points readers to a proposal file that does not exist in this repository at the PR commit. That leaves the new project documentation with a dead reference.

Findings

• [medium] The proposal link in CLAUDE.md is broken.
  • File: CLAUDE.md:42
  • Suggestion: either add the referenced docs/PROPOSAL-plotlink.md file in this PR, or update the link to a proposal path that actually exists in the repo.

Decision

Request changes because the new documentation should not ship with a dead internal reference, especially when the issue explicitly asks for a proposal link.

[project7-interns]

Verdict: APPROVE

Summary

The follow-up commit resolves the dead internal reference by removing the broken proposal link and replacing it with an accurate note. CLAUDE.md now satisfies the ticket requirement to provide project context without pointing readers at a missing file.

Findings

• None.

Decision

Approve. The documentation is focused, the earlier defect is addressed, and CI is green.