chore(local): add scratchpad folder guard

[glassBead-tc]

Summary

• add a gitignored local scratch directory with tracked sentinel file
• keep local references nearby without polluting git status

Test plan

• not run (repo hygiene change)

[greptile-apps]

Greptile Overview

Greptile Summary

Added a gitignored local/ directory with a tracked sentinel .keep file to provide a scratchpad space for local development artifacts without polluting git status.

• Added local/ to .gitignore with negation pattern !local/.keep to track the directory structure
• Created local/.keep sentinel file with descriptive comment (has duplicate line)
• Pattern follows existing repository convention (similar to dgm-specs/history/runs/.gitkeep)
• Aligns with repo hygiene goals evident in recent commits about local artifacts

Confidence Score: 5/5

• Safe to merge - simple repository hygiene change with no runtime impact
• This is a straightforward gitignore configuration change that adds a local scratchpad directory. The pattern is consistent with existing repository practices, follows git best practices, and has zero risk of breaking functionality.
• No files require special attention

Important Files Changed

Filename	Overview
local/.keep	Created sentinel file with duplicate description line

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Git as Git
    participant FS as File System
    
    Dev->>FS: Create local/ directory
    Dev->>FS: Add local/.keep file
    Note over FS: Sentinel file keeps directory in git
    Dev->>Git: Update .gitignore
    Note over Git: Add local/ to ignore list
    Note over Git: Except local/.keep (!local/.keep)
    Dev->>FS: Add files to local/ directory
    Note over FS: Files in local/ (except .keep)
    Git->>Git: Ignore local/* files
    Note over Git: Only local/.keep is tracked
    Dev->>Git: git status
    Git->>Dev: Clean working tree
    Note over Dev,Git: Local scratchpad files don't pollute status

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[greptile-apps]

_{1 file reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

duplicate line (line 1 is identical)

Suggested change

local scratchpad (intentionally empty)

Prompt To Fix With AI

This is a comment left during a code review.
Path: local/.keep
Line: 2:2

Comment:
duplicate line (line 1 is identical)

```suggestion
```

How can I resolve this? If you propose a fix, please make it concise.