feat: add error detection, monitoring, and code quality improvements (#223)

* feat: add error detection, monitoring, and code quality improvements

This comprehensive update addresses automatic error detection, code
quality, and plugin development experience:

## Error Detection & Monitoring
- Add ErrorAggregator service for centralized error tracking
- Add pattern detection for recurring errors (5+ in 60 min)
- Add error dashboard API endpoints (/api/v3/errors/*)
- Integrate error recording into plugin executor

## Code Quality
- Remove 10 silent `except: pass` blocks in sports.py and football.py
- Remove hardcoded debug log paths
- Add pre-commit hooks to prevent future bare except clauses

## Validation & Type Safety
- Add warnings when plugins lack config_schema.json
- Add config key collision detection for plugins
- Improve type coercion logging in BasePlugin

## Testing
- Add test_config_validation_edge_cases.py
- Add test_plugin_loading_failures.py
- Add test_error_aggregator.py

## Documentation
- Add PLUGIN_ERROR_HANDLING.md guide
- Add CONFIG_DEBUGGING.md guide

Note: GitHub Actions CI workflow is available in the plan but requires
workflow scope to push. Add .github/workflows/ci.yml manually.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: address code review issues

- Fix GitHub issues URL in CONFIG_DEBUGGING.md
- Use RLock in error_aggregator.py to prevent deadlock in export_to_file
- Distinguish missing vs invalid schema files in plugin_manager.py
- Add assertions to test_null_value_for_required_field test
- Remove unused initial_count variable in test_plugin_load_error_recorded
- Add validation for max_age_hours in clear_old_errors API endpoint

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Chuck <chuck@example.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

src/plugin_system/plugin_executor.py

@@ -13,6 +13,7 @@ import logging
 
 from src.exceptions import PluginError
 from src.logging_config import get_logger
+from src.error_aggregator import record_error
 
 
 class TimeoutError(Exception):
@@ -80,12 +81,15 @@ class PluginExecutor:
         if not result_container['completed']:
             error_msg = f"{plugin_context} operation timed out after {timeout}s"
             self.logger.error(error_msg)
-            raise TimeoutError(error_msg)
-        
+            timeout_error = TimeoutError(error_msg)
+            record_error(timeout_error, plugin_id=plugin_id, operation="timeout")
+            raise timeout_error
+
         if result_container['exception']:
             error = result_container['exception']
             error_msg = f"{plugin_context} operation failed: {error}"
             self.logger.error(error_msg, exc_info=True)
+            record_error(error, plugin_id=plugin_id, operation="execute")
             raise PluginError(error_msg, plugin_id=plugin_id) from error
         
         return result_container['value']
@@ -128,7 +132,7 @@ class PluginExecutor:
             self.logger.error("Plugin %s update() timed out", plugin_id)
             return False
         except PluginError:
-            # Already logged in execute_with_timeout
+            # Already logged and recorded in execute_with_timeout
             return False
         except Exception as e:
             self.logger.error(
@@ -137,6 +141,7 @@ class PluginExecutor:
                 e,
                 exc_info=True
             )
+            record_error(e, plugin_id=plugin_id, operation="update")
             return False
     
     def execute_display(
@@ -203,7 +208,7 @@ class PluginExecutor:
             self.logger.error("Plugin %s display() timed out", plugin_id)
             return False
         except PluginError:
-            # Already logged in execute_with_timeout
+            # Already logged and recorded in execute_with_timeout
             return False
         except Exception as e:
             self.logger.error(
@@ -212,6 +217,7 @@ class PluginExecutor:
                 e,
                 exc_info=True
             )
+            record_error(e, plugin_id=plugin_id, operation="display")
             return False
     
     def execute_safe(