fix: Fix clang-tidy pre-commit hook to locate compile_commands.json from repo root

[pratikmankawde]

High Level Overview of Change

Fix the bin/pre-commit/clang_tidy_check.py pre-commit hook so it correctly locates the repo root when searching for build/compile_commands.json. Previously the script computed the repo root as Path(__file__).parent.parent, which resolves to bin/ rather than the repository root, causing the hook to fail to find the compile database.

Also marks .github/scripts/levelization/generate.py as executable (mode change only).

Context of Change

The pre-commit hook needs compile_commands.json (generated under <repo_root>/build/) to drive clang-tidy. The previous path computation was off by one directory level, so the hook never found the compile database when invoked from the project. The fix uses git rev-parse --show-toplevel (with cwd pinned to the script's directory) to obtain the true repo root regardless of where the hook is invoked from.

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

Test Plan

• Stage a C++ file change and run the pre-commit hook with TIDY=1; confirm the hook now locates build/compile_commands.json and runs clang-tidy against staged files.
• Run from a subdirectory of the repo to verify the git rev-parse lookup still resolves the repo root correctly.

[xrplf-ai-reviewer]

No issues.

Review by Claude Opus 4.6 · Prompt: V15

[mathbunnyru]

nit: I would probably put it as REPO_ROOT in the top of the file

[pratikmankawde]

I can, wrap it in a cached accessor, not let it be a const, change the signatures of functions needing it. It will need more efforts for you guys to review. I would rather leave be for now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.3%. Comparing base (a911f90) to head (63ce2ee).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #7325     +/-   ##
=========================================
- Coverage     82.4%   82.3%   -0.0%     
=========================================
  Files         1011    1011             
  Lines        76330   76330             
  Branches      7318    7316      -2     
=========================================
- Hits         62874   62850     -24     
- Misses       13456   13480     +24     

see 10 files with indirect coverage changes

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