chore(dev): add staged-file formatting pre-commit hook

[axelpey]

No description provided.

[greptile-apps]

Greptile Summary

Added automated code formatting via git pre-commit hook. The hook formats only staged Python and C/C++ files using ruff and clang-format respectively, then re-stages the formatted files. Installation is handled through make install-hooks.

Key Changes:

• Pre-commit hook with robust null-byte delimited file handling using git diff -z
• Graceful failure if formatting tools are missing with helpful installation hints
• Makefile target for easy hook installation via git config core.hooksPath
• Documentation added to README with tool installation instructions

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The implementation follows bash best practices with proper error handling (set -euo pipefail), null-byte delimited file parsing to handle filenames with spaces, file existence checks, and graceful tool availability checks. The changes are purely development tooling and won't affect production code.
• No files require special attention

Important Files Changed

Filename	Overview
.githooks/pre-commit	Adds pre-commit hook to format Python and C/C++ files on staged changes
Makefile	Adds install-hooks target to configure git hooks from .githooks directory
README.md	Documents the new development hooks setup and usage instructions

Flowchart

flowchart TD
    A[Git Commit Triggered] --> B[Pre-commit Hook Runs]
    B --> C[Get Staged Files]
    C --> D{Any Staged Files?}
    D -->|No| E[Exit Success]
    D -->|Yes| F[Categorize by Extension]
    F --> G[Filter Python Files]
    F --> H[Filter C/C++ Files]
    G --> I{Python Files?}
    H --> J{C/C++ Files?}
    I -->|Yes| K[Check ruff Available]
    K -->|Not Found| L[Exit Error]
    K -->|Found| M[Run ruff check --fix]
    M --> N[Run ruff format]
    N --> O[Stage Formatted Files]
    I -->|No| P{Done with Python?}
    J -->|Yes| Q[Check clang-format Available]
    Q -->|Not Found| L
    Q -->|Found| R[Run clang-format -i]
    R --> S[Stage Formatted Files]
    J -->|No| T{Done with C/C++?}
    O --> P
    S --> T
    P --> J
    T --> E

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