refactor(semantics): migrate legacy @TIER to @COMPLEXITY annotations

- Replaced @TIER: TRIVIAL with @COMPLEXITY: 1
- Replaced @TIER: STANDARD with @COMPLEXITY: 3
- Replaced @TIER: CRITICAL with @COMPLEXITY: 5
- Manually elevated specific critical/complex components to levels 2 and 4
- Ignored legacy, specs, and node_modules directories
- Updated generated semantic map

frontend/src/components/TaskLogViewer.svelte

@@ -1,6 +1,6 @@
 <!-- [DEF:TaskLogViewer:Component] -->
 <!--
-@TIER: CRITICAL
+@COMPLEXITY: 5
 @SEMANTICS: task, log, viewer, inline, realtime
 @PURPOSE: Displays task logs inline (in drawer) or as modal. Merges real-time WebSocket logs with polled historical logs.
 @LAYER: UI
@@ -148,7 +148,7 @@
     <!-- @PURPOSE: Shows inline logs -->
     <!-- @LAYER: UI -->
     <!-- @SEMANTICS: logs, inline -->
-    <!-- @TIER: STANDARD -->
+    <!-- @COMPLEXITY: 3 -->
     {#if inline}
         <div class="flex flex-col h-full w-full">
             {#if loading && logs.length === 0}
@@ -186,7 +186,7 @@
         <!-- @PURPOSE: Shows modal logs -->
         <!-- @LAYER: UI -->
         <!-- @SEMANTICS: logs, modal -->
-        <!-- @TIER: STANDARD -->
+        <!-- @COMPLEXITY: 3 -->
         <div
             class="fixed inset-0 z-50 overflow-y-auto"
             aria-labelledby="modal-title"