fix(maintenance): auto-expiry + adaptive markdown height + tests

- Auto-expiry: expired events auto-end on GET /events via task manager
- Height: _estimate_markdown_height adapted to unit=8px scale with padding detection
- CRITICAL-1: removed dead import remove_chart_from_position (QA finding)
- CRITICAL-2: added chart alive check in ensure_banner_chart (QA finding)
- CRITICAL-3: fixed test assertions update_markdown_chart → update_banner_on_dashboard
- @POST contract: fixed return range [2,12] → [19,200]
- Tests: 8 new tests (auto-expiry + layout height)

backend/src/plugins/git_plugin.py

@@ -35,32 +35,22 @@ class GitPlugin(PluginBase):
 
     # region __init__ [TYPE Function]
     # @PURPOSE: Инициализирует плагин и его зависимости.
-    # @PRE: config.json exists or shared config_manager is available.
+    # @PRE: shared config_manager доступен через src.dependencies.
     # @POST: Инициализированы git_service и config_manager.
     def __init__(self):
         with belief_scope("GitPlugin.__init__"):
             app_logger.info("Initializing GitPlugin.")
             self.git_service = GitService()
 
-            # Robust config path resolution:
-            # 1. Try absolute path from src/dependencies.py style if possible
-            # 2. Try relative paths based on common execution patterns
-            if os.path.exists("../config.json"):
-                config_path = "../config.json"
-            elif os.path.exists("config.json"):
-                config_path = "config.json"
-            else:
-                # Fallback to the one initialized in dependencies if we can import it
-                try:
-                    from src.dependencies import config_manager
-                    self.config_manager = config_manager
-                    app_logger.info("GitPlugin initialized using shared config_manager.")
-                    return
-                except Exception:
-                    config_path = "config.json"
-
-            self.config_manager = ConfigManager(config_path)
-            app_logger.info(f"GitPlugin initialized with {config_path}")
+            # Используем shared config_manager из dependencies
+            try:
+                from src.dependencies import config_manager
+                self.config_manager = config_manager
+                app_logger.info("GitPlugin initialized using shared config_manager.")
+            except Exception as exc:
+                app_logger.error(f"GitPlugin: failed to get shared config_manager: {exc}")
+                self.config_manager = ConfigManager()
+                app_logger.info("GitPlugin initialized with fallback ConfigManager.")
     # endregion __init__
 
     @property