Initial commit: Charge Billed Automation bot

Waystar Charge Billed Report bot. Reads CMS-1500 claim PDFs from the
text layer (src/cms1500_text.py) instead of Google Document AI.
Dependencies managed with uv (Python 3.12). Secrets, PHI and build
output are git-ignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_selftest.py

@@ -0,0 +1,18 @@
+"""The --selftest switch must check the build without touching Chrome or Waystar."""
+import ChargeBilledAutomation as bot
+
+
+def test_selftest_without_pdfs_passes_and_says_so(capsys):
+    assert bot.self_test([]) == 0
+    assert "SELFTEST OK" in capsys.readouterr().out
+
+
+def test_selftest_fails_for_unreadable_pdf(capsys, tmp_path):
+    assert bot.self_test([str(tmp_path / "missing.pdf")]) == 1
+    assert "SELFTEST FAILED" in capsys.readouterr().out
+
+
+def test_selftest_never_starts_chrome(monkeypatch):
+    monkeypatch.setattr(bot, "kill_all_chrome", lambda: (_ for _ in ()).throw(AssertionError("Chrome touched")))
+    monkeypatch.setattr(bot, "start_chrome_debug", lambda *a: (_ for _ in ()).throw(AssertionError("Chrome touched")))
+    assert bot.self_test([]) == 0