feat: implement cost report template generator with Claude session tracking (issue #119)

Comprehensive cost tracking system implementation including:

- Cost report generator with multiple formats (summary, detailed, audit)
- Full CLI integration with cost management commands
- Claude session cost tracking and estimation
- Professional markdown reports with frontmatter/contentmatter
- Automatic cost note generation for issue implementations
- Complete test coverage (33 test cases)
- Database integration with finance schema initialization

🤖 Generated with [Claude Code](https://claude.ai/code)

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

markitect/cli.py

@@ -31,6 +31,13 @@ from .__version__ import get_version_info, get_release_info
 from .batch_processor import BatchProcessor, ProcessingMode, ErrorHandling, create_file_processor
 from .config_manager import ConfigurationManager
 
+# Import cost tracking commands
+try:
+    from .finance.cli import cost_commands
+    COST_TRACKING_AVAILABLE = True
+except ImportError:
+    COST_TRACKING_AVAILABLE = False
+
 
 def get_database_path(config):
     """Get database path from config."""
@@ -6545,6 +6552,10 @@ def categories(config):
         print(f"  {category}: {len(paradigms)} paradigms")
 
 
+# Register cost tracking commands
+if COST_TRACKING_AVAILABLE:
+    cli.add_command(cost_commands)
+
 # Register paradigms commands
 cli.add_command(paradigms)