refactor(cleanup): v0.5.0 Collector 제거 + dead code 정리 + HttpBridgeContext 버그 수정

- DELETE collector.py (523줄)
- main.py: BOT_MODE=remote 분기 제거
- gateway.py: Collector REST 6개 endpoint 제거 (311→168줄)
- bridge.py: RemoteTransport 제거 (480→270줄)
- config.py: REMOTE_BRIDGE_URL 제거
- extension.ts: dead code 4개 + stale module vars 제거
- step-probe.ts: getStepProbeContext() 추가, autoApproveEnabled 제거
- FIX: HttpBridgeContext stale primitive (getter 패턴으로 수정)
- ADD: extension.log rotation (10MB→2MB tail)
- docs: architecture.md, tech-stack.md, known-issues.md 업데이트

extension/src/step-probe.ts

@@ -14,7 +14,6 @@ export interface BridgeContext {
     projectName: string;
     sdk: any;
     wsBridge: WSBridgeClient | null;
-    autoApproveEnabled: boolean;
     activeSessionId: string;
     sessionStalled: boolean;
     lastPendingStepIndex: number;
@@ -64,6 +63,18 @@ export function getActiveSessionId(): string {
     return ctx?.activeSessionId || '';
 }
 
+/**
+ * Get step-probe context values for http-bridge.
+ * Prevents stale primitive copies by reading live ctx values.
+ */
+export function getStepProbeContext(): { activeSessionId: string; sessionStalled: boolean; lastPendingStepIndex: number } {
+    return {
+        activeSessionId: ctx?.activeSessionId || '',
+        sessionStalled: ctx?.sessionStalled ?? false,
+        lastPendingStepIndex: ctx?.lastPendingStepIndex ?? -1,
+    };
+}
+
 /**
  * Reset pending state after successful approval.
  * Called after WS response triggers approval in extension.ts.