chore(gitignore): group Claude tooling entries under their own section

[pratyush618]

Summary

• Move CLAUDE.md and .claude/ out of the # Python block in .gitignore into a new dedicated section — they are not Python artifacts, and the misplacement was noticed while investigating an unrelated CI issue.

Context

The CodeQL "Code Quality: Push on main" run on 8f79339 (24532446213) is red because of a transient SARIF upload failure in the JavaScript/TypeScript analyse job — the Python job on the same run succeeded, the same commit passed CodeQL on the PR 4× before merging, and the previous / next CodeQL runs on main are both green. GitHub blocks rerun on default-setup CodeQL workflows ("This workflow run cannot be retried"), so the only way to clear the red check on main@HEAD is to trigger a fresh analysis via a new push. This PR is the carrier for that new push while also being a legitimate tiny cleanup.

Test plan

• git diff shows only .gitignore moves, no semantic change to what is ignored
• Code Quality check runs green on this PR
• After merge, the new Code Quality: Push on main run is green