Why

Formatter behavior can differ between local and CI runs, which causes avoidable red CI and slows review throughput. This PR makes formatter behavior explicit and adds a quick local diff workflow so contributors can reproduce CI formatting outcomes immediately.

Closes #9836
Note: lobster-biscuit

Split Context

This PR was split from closed umbrella PR #9761: #9761.

Detailed Changes

• Updated .oxfmtrc.jsonc:
  • Added tabWidth: 2
  • Added useTabs: false
  • Added docker-compose.yml to ignorePatterns
• Updated package.json scripts:
  • Added format:diff as oxfmt --write && git --no-pager diff

Related Links and Issues

• Closed source PR: feat(hooks): fixed and adding various agent, messaging, system and compaction hooks #9761
• Formatting/CI issue: [Bug]: oxmft on github ci/cd not matching local #9836

Greptile Overview

Greptile Summary

This PR makes oxfmt formatting behavior consistent between local and CI by explicitly setting tabWidth: 2 and useTabs: false in .oxfmtrc.jsonc, and by ignoring docker-compose.yml.

It also adds a developer convenience script format:diff that runs oxfmt --write and immediately shows the resulting git diff, helping contributors reproduce CI formatting outcomes locally.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• The changes are limited to formatter configuration and a new local-only formatting helper script, with no impact on runtime code paths. The edits are syntactically valid JSONC/package.json changes and are unlikely to break CI behavior.
• No files require special attention

Context used:

• Context from dashboard - CLAUDE.md (source)
• Context from dashboard - AGENTS.md (source)