Build + Pre-Commit Fixes

[shinybrar]

This pull request includes several changes to improve the build process, enhance pre-commit checks, and update documentation paths. The most important changes are grouped by theme below.

Build Process Improvements:

• [.github/workflows/cd.edge.build.yml | cd.release.build.yml] Simplified the cosign sign command to use the build output digest and removed redundant signing commands.

Pre-Commit Configuration:

• .pre-commit-config.yaml: Added a comprehensive pre-commit configuration file, including hooks for commit message validation, large file checks, syntax checks for various file types, and a custom Gradle build hook, etc.

Documentation Updates:

• README.md: Corrected the paths for architecture diagram images to ensure they are correctly displayed in the documentation.

Code Formatting:

• skaha/build.gradle: Enhanced the Spotless configuration to enforce UTF-8 encoding, format only files that differ from the main branch, and updated the Java formatting style to the latest version.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 18.61%. Comparing base (12b2bf3) to head (49e246d).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #738   +/-   ##
=========================================
  Coverage     18.61%   18.61%           
  Complexity      102      102           
=========================================
  Files            22       22           
  Lines          1961     1961           
  Branches        270      270           
=========================================
  Hits            365      365           
  Misses         1544     1544           
  Partials         52       52           

Flag	Coverage Δ
skaha-unittests-coverage	18.61% <ø> (ø)

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