fix: classify Android androidTest/ sources and *IT.java/*IT.kt as test files

[bittoby]

Fixes #765

Summary

FileChange.is_test_file() missed three real-world test conventions, causing those files to be scored at full production weight (1.0) instead of TEST_FILE_CONTRIBUTION_WEIGHT (0.05) — a 20× over-score per token:

• Gradle Android test source sets: androidTest/, androidTestGeneric/, androidTestGplay/, etc.
• Gradle integration-test source sets: integrationTest/ — also covers Maven Failsafe *IT.java/.kt/.kts files, which by convention live under src/test/ or src/integrationTest/ and are caught by the directory rule rather than a filename-suffix rule.
• Ruby RSpec: the spec/ directory and the *_spec.{rb,js,ts,…} filename suffix.

Impact is concrete: nextcloud/android keeps its integration tests under app/src/androidTest/... (16+ files like UploadIT.java, AbstractIT.java, ActivitiesFragmentIT.kt); Ruby projects keep specs under spec/models/account_spec.rb. Each was previously mis-scored at production weight.

Changes

• gittensor/classes.py:
  • Added (^|/)androidtest[a-z]*/, (^|/)integrationtest/, and (^|/)spec/ to the directory pattern set.
  • Added _spec\.[^.]+$ to the basename pattern set.
  • Promoted both pattern sets to module-level re.compile-backed tuples (_TEST_DIR_PATTERNS, _TEST_BASENAME_PATTERNS) and extracted two small helpers (_matches_test_dir_pattern, _matches_test_basename_pattern) — avoids re-allocating and re-compiling the lists on every call to is_test_file().
• tests/test_classes.py: 23 new parametrized assertions across 3 test functions, plus a regression check covering the pre-existing conventions — Gradle Android & integrationTest paths, Ruby RSpec spec/ paths and _spec.* suffixes, and lookalike negatives (Edit.java, build.gradle.kts, docs/androidtest.md, specification.rb, spectrum.rb, spec.rb).

Test Plan

• pytest tests/test_classes.py — 25 passed
• pytest tests/ — 676 passed, 0 regressions
• pre-commit run --all-files --hook-stage pre-push — ruff, pyright, pytest all pass
• Verified the issue reproducer (app/src/androidTest/java/...IT.java) now returns True
• Verified false-positive candidates (Edit.java, Commit.java, Unit.kt, build.gradle.kts, docs/androidtest.md, specification.rb, spectrum.rb, spec.rb) still return False

[anderdc]

Drop the IT-suffix regex — the new androidtest[a-z]*/ and integrationtest/ directory patterns cover every real-world case (Maven Failsafe puts *IT.java under src/test/, Gradle Android puts them under androidTest/). The IT-suffix branch only catches hypothetical files outside any test directory and risks false-positives on production classes named *IT.{java,kt,kts}.

[bittoby]

Drop the IT-suffix regex — the new androidtest[a-z]*/ and integrationtest/ directory patterns cover every real-world case (Maven Failsafe puts *IT.java under src/test/, Gradle Android puts them under androidTest/). The IT-suffix branch only catches hypothetical files outside any test directory and risks false-positives on production classes named *IT.{java,kt,kts}.

Fixed all!