Move Claude settings from local to checked-in (#4537)

## Summary

Rename `.claude/settings.local.json` to `.claude/settings.json`.

This was added in #4525 under the incorrect file name.

See https://code.claude.com/docs/en/settings#available-scopes

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: pietern