Fix diff parser regex to handle filenames with spaces and special chars

[that-github-user]

Summary

src/scoring/diff-parser.ts:22:

const match = line.match(/diff --git a\/(.+) b\/(.+)/);

This regex breaks on filenames with spaces. Git outputs quoted paths for such files:

diff --git a/"my file.ts" b/"my file.ts"

The regex won't capture the quotes correctly, breaking convergence analysis for repos with spaces in filenames.

Proposed fix

Handle both quoted and unquoted paths:

const match = line.match(/diff --git "?a\/(.+?)"? "?b\/(.+?)"?$/);

Test case

Add a test with a diff containing "src/my component.tsx".

[that-github-user]

Fixed in #41. Diff parser regex now handles quoted paths for filenames with spaces. Added test case for quoted path parsing.