Add direnv to gitignore

[Kaweees]

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[greptile-apps]

Greptile Summary

Added .direnv/ to gitignore to prevent tracking direnv's cache directory, which stores environment variable metadata and should not be version controlled.

• Standard practice for projects using direnv (repository already has .envrc.nix and .envrc.venv files)
• Placement is appropriate alongside related .envrc and .claude entries
• No issues found

Confidence Score: 5/5

• This PR is safe to merge with no risk
• This is a trivial, standard gitignore addition with no potential for introducing bugs or breaking changes
• No files require special attention

Important Files Changed

Filename	Overview
.gitignore	Added .direnv/ directory to ignore list for direnv cache files

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Git as Git
    participant Direnv as Direnv Tool
    participant FS as File System

    Dev->>Direnv: Uses direnv to manage environment
    Direnv->>FS: Creates .direnv/ cache directory
    Note over FS: .direnv/ stores environment cache
    Dev->>Git: Commits changes
    Git->>FS: Checks .gitignore
    Note over Git,FS: .direnv/ entry prevents tracking
    Git->>Dev: Ignores .direnv/ directory

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[greptile-apps]

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