v0.3.1

Bug-fix release for two issues exposed by dogfooding 0.3.0 against php-src.

Fixed

• codesage git-index was dropping test-like files from co-change pair generation entirely, which made recommend_tests's coupled section empty for codebases where tests are the primary partner of source changes (e.g., php-src .c ↔ .phpt). Now only test↔test pairs are skipped (which is the actual noise); source↔test pairs are kept (which is the signal recommend_tests needs).
• recommend_tests for .c / .h source files now lists .phpt tests in <dir>/tests/ as primary (php-src convention). Skips when the tests/ directory has more than 50 files (typical of ext/standard/tests/) — that's too noisy for "primary" and the agent should rely on coupling history instead.

Required action

Re-run codesage git-index --full in any repo that was indexed under 0.3.0 to repopulate co-change pairs with the corrected logic.