test: add basic test suite for fojin_bridge, skill_writer, verify_sources (P1)

31 tests across 3 modules; all HTTP calls mocked, no real API dependencies.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,9 @@
+"""Shared pytest fixtures for Buddha-skill tests."""
+
+import sys
+import os
+from pathlib import Path
+
+# Add tools/ to path so tests can import modules
+PROJECT_ROOT = Path(__file__).parent.parent
+sys.path.insert(0, str(PROJECT_ROOT / "tools"))