Add Claude Code statusline (folder, git branch, model, context bar)

[pluslove0557-stack]

Summary

• Add claude-code/statusline.js, a Node-based Claude Code statusLine script that prints the current folder, git branch, active model, and a colored context-usage progress bar (green/yellow/red, defaults to a 200K token window, overridable via CLAUDE_CONTEXT_WINDOW)
• Add claude-code/README.md with setup instructions for wiring the script into ~/.claude/settings.json

Test plan

• Ran the script with a sample stdin payload (workspace dir, model, transcript with usage tokens) and confirmed folder/branch/model/bar render correctly
• Verified graceful fallback when there's no transcript path (bar omitted) and when cwd isn't a git repo (branch omitted)
• Verified empty/malformed stdin doesn't crash the script

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