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/out/extension.js

@@ -67,6 +67,15 @@ function logToFile(msg) {
         if (!bridgePath)
             return;
         const logFile = path.join(bridgePath, 'extension.log');
+        // Log rotation: truncate when >10MB, keep last 2MB
+        try {
+            const stat = fs.statSync(logFile);
+            if (stat.size > 10 * 1024 * 1024) {
+                const content = fs.readFileSync(logFile, 'utf-8');
+                fs.writeFileSync(logFile, content.slice(-2 * 1024 * 1024), 'utf-8');
+            }
+        }
+        catch { /* file doesn't exist yet */ }
         fs.appendFileSync(logFile, line + '\n', 'utf-8');
     }
     catch (e) {
@@ -84,15 +93,6 @@ let isActive = false;
 let autoApproveEnabled = false; // toggled via !auto from Discord
 let watcher = null;
 let wsBridge = null; // WebSocket Hub connection
-const sentPendingIds = new Set();
-// Memory-based dedup: tracks recently created pending step_indexes to prevent
-// regeneration after pending file deletion (by Collector/Bot response cycle).
-// Map<string, number> = `${conversationId}:${stepIndex}` → creation timestamp
-const recentPendingSteps = new Map();
-const PENDING_MEMORY_TTL_MS = 60_000; // 60 seconds memory retention
-// In-memory cache for diff_review metadata (survives pending file deletion by Collector).
-// Map<request_id, { edit_step_indices, modified_files }>
-const diffReviewMetadata = new Map();
 // ─── Project Detection ───
 function detectProjectName() {
     const config = vscode.workspace.getConfiguration('gravityBridge');
@@ -374,11 +374,6 @@ async function fixLSConnection() {
 }
 // ─── Approval Observer + Product.json Checksums extracted to ./html-patcher.ts ───
 // ─── HTTP Bridge Server extracted to ./http-bridge.ts ───
-// Shared state for HTTP bridge context (module-level, referenced by BridgeContext too)
-let sessionStalled = false;
-let lastPendingStepIndex = -1;
-let stallProbed = false;
-let sawRunningAfterPending = true;
 // ─── Step Probe, Response Watcher, Approval Strategies → extracted to ./step-probe.ts ───
 async function activate(context) {
     console.log('Gravity Bridge: activating...');
@@ -503,12 +498,11 @@ async function activate(context) {
             projectName,
             sdk,
             wsBridge,
-            autoApproveEnabled,
             activeSessionId,
-            sessionStalled,
-            lastPendingStepIndex,
-            stallProbed,
-            sawRunningAfterPending,
+            sessionStalled: false,
+            lastPendingStepIndex: -1,
+            stallProbed: false,
+            sawRunningAfterPending: true,
             setClickTrigger: (action) => {
                 const { setClickTrigger: setTrigger } = require('./http-bridge');
                 setTrigger(action);
@@ -520,10 +514,12 @@ async function activate(context) {
             writeChatSnapshot,
             writeChatSnapshotWithFiles,
         });
-        // Start HTTP bridge, then setup observer
+        // Start HTTP bridge with live step-probe state (prevents stale primitive bug)
         const httpBridgeCtx = {
-            bridgePath, projectName, activeSessionId, wsBridge,
-            sessionStalled, lastPendingStepIndex, logToFile,
+            bridgePath, projectName, wsBridge, logToFile,
+            get activeSessionId() { return (0, step_probe_1.getStepProbeContext)().activeSessionId; },
+            get sessionStalled() { return (0, step_probe_1.getStepProbeContext)().sessionStalled; },
+            get lastPendingStepIndex() { return (0, step_probe_1.getStepProbeContext)().lastPendingStepIndex; },
         };
         const bridgePort = await (0, http_bridge_1.startHttpBridge)(httpBridgeCtx, sdk);
         if (bridgePort) {