fix: Operation Lightspeed review fixes — padding, dead code, tablet WebGL

- Add SSE padding to backpressure drain write for tunnel clients
- Remove dead SessionTerminal from broadcast padding check
- Trim whitespace in SSE session filter query params
- Remove unused _bufferLazyTerminalData scaffolding code
- Skip WebGL on tablets too, not just phones (canvas fallback)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/web/public/app.js

@@ -624,8 +624,8 @@ class CodemanApp {
     // oversized terminal.write() calls that triggered the stalls.
     // Disable with ?nowebgl URL param if GPU issues return.
     this._webglAddon = null;
-    const isMobile = MobileDetection.getDeviceType() === 'mobile';
-    if (!isMobile && !new URLSearchParams(location.search).has('nowebgl') && typeof WebglAddon !== 'undefined') {
+    const skipWebGL = MobileDetection.getDeviceType() !== 'desktop';
+    if (!skipWebGL && !new URLSearchParams(location.search).has('nowebgl') && typeof WebglAddon !== 'undefined') {
       try {
         this._webglAddon = new WebglAddon.WebglAddon();
         this._webglAddon.onContextLoss(() => {
@@ -10157,7 +10157,6 @@ class CodemanApp {
         windowEntry._lazyTerminal = true;
         windowEntry._lazyPaneTarget = paneData.paneTarget;
         windowEntry._lazySessionId = paneData.sessionId;
-        windowEntry._lazyBuffer = '';
       }
     } else {
       this.initTeammateTerminal(windowId, paneData, win);

src/web/public/subagent-windows.js

@@ -471,13 +471,9 @@ Object.assign(CodemanApp.prototype, {
   //   restore  → _restoreTeammateTerminalFromLazy()   → re-creates Terminal
   //   create (hidden/minimized) → skip initTeammateTerminal, set _lazyTerminal
   //
-  // The pane buffer is always re-fetched from the API on restore, so no
-  // client-side buffer accumulation is needed (the tmux pane is the source
-  // of truth). Regular (non-teammate) subagent windows use activity HTML
-  // and are unaffected by this optimization.
-
-  /** Max bytes to buffer for a minimized teammate terminal (256KB). */
-  _LAZY_TERMINAL_BUFFER_CAP: 256 * 1024,
+  // The tmux pane buffer is re-fetched from the API on restore. Regular
+  // (non-teammate) subagent windows use activity HTML and are unaffected
+  // by this optimization.
 
   /**
    * Dispose a teammate terminal when its window is minimized.
@@ -495,8 +491,6 @@ Object.assign(CodemanApp.prototype, {
       windowData._lazyTerminal = true;
       windowData._lazyPaneTarget = termData.paneTarget;
       windowData._lazySessionId = termData.sessionId;
-      // Buffer for any data that arrives while minimized (from pendingData or future writes)
-      windowData._lazyBuffer = '';
     }
 
     // Dispose the resize observer
@@ -532,7 +526,6 @@ Object.assign(CodemanApp.prototype, {
     windowData._lazyTerminal = false;
     windowData._lazyPaneTarget = null;
     windowData._lazySessionId = null;
-    windowData._lazyBuffer = null;
 
     if (!paneTarget || !sessionId) return;
 
@@ -541,29 +534,6 @@ Object.assign(CodemanApp.prototype, {
     this.initTeammateTerminal(agentId, paneInfo, windowData.element);
   },
 
-  /**
-   * Append terminal data to a minimized teammate terminal's lazy buffer.
-   * Called when SSE data arrives for a minimized window. Caps at _LAZY_TERMINAL_BUFFER_CAP.
-   * Returns true if the data was buffered, false if the window is not in lazy mode.
-   */
-  _bufferLazyTerminalData(agentId, data) {
-    const windowData = this.subagentWindows.get(agentId);
-    if (!windowData || !windowData._lazyTerminal) return false;
-
-    if (windowData._lazyBuffer === null || windowData._lazyBuffer === undefined) {
-      windowData._lazyBuffer = '';
-    }
-
-    // Append data, capping total size
-    windowData._lazyBuffer += data;
-    if (windowData._lazyBuffer.length > this._LAZY_TERMINAL_BUFFER_CAP) {
-      // Keep only the tail to stay under cap
-      windowData._lazyBuffer = windowData._lazyBuffer.slice(-this._LAZY_TERMINAL_BUFFER_CAP);
-    }
-
-    return true;
-  },
-
   // ═══════════════════════════════════════════════════════════════
   // Subagent Floating Windows
   // ═══════════════════════════════════════════════════════════════
@@ -809,7 +779,6 @@ Object.assign(CodemanApp.prototype, {
           windowEntry._lazyTerminal = true;
           windowEntry._lazyPaneTarget = paneInfo.paneTarget;
           windowEntry._lazySessionId = paneInfo.sessionId;
-          windowEntry._lazyBuffer = '';
         }
       } else {
         this.initTeammateTerminal(agentId, paneInfo, win);

src/web/server.ts

@@ -601,7 +601,10 @@ export class WebServer extends EventEmitter {
       const query = req.query as { sessions?: string };
       let sessionFilter: Set<string> | null = null;
       if (query.sessions) {
-        const ids = query.sessions.split(',').filter(Boolean);
+        const ids = query.sessions
+          .split(',')
+          .map((s) => s.trim())
+          .filter(Boolean);
         if (ids.length > 0) {
           sessionFilter = new Set(ids);
         }
@@ -1963,7 +1966,8 @@ export class WebServer extends EventEmitter {
           // Client may have missed terminal data during backpressure.
           // Tell it to reload the active session's buffer to recover.
           try {
-            reply.raw.write(`event: ${SseEvent.SessionNeedsRefresh}\ndata: {}\n\n`);
+            const drainPadding = this._isTunnelActive ? SSE_PADDING : '';
+            reply.raw.write(`event: ${SseEvent.SessionNeedsRefresh}\ndata: {}\n\n${drainPadding}`);
           } catch {
             /* client gone */
           }
@@ -1990,13 +1994,10 @@ export class WebServer extends EventEmitter {
     }
     // Performance optimization: serialize JSON once for all clients.
     // Only append Cloudflare tunnel padding for latency-sensitive events —
-    // high-frequency terminal data and recovery events need immediate proxy flush,
-    // but low-frequency metadata events (session:created, ralph:*, respawn:*, etc.)
-    // are small and infrequent enough that proxy buffering doesn't matter.
-    // Note: session:terminal bypasses broadcast() via flushSessionTerminalBatch(),
-    // but is included here for completeness in case the path changes.
-    const needsPadding =
-      this._isTunnelActive && (event === SseEvent.SessionTerminal || event === SseEvent.SessionNeedsRefresh);
+    // Recovery events need immediate proxy flush; low-frequency metadata events
+    // (session:created, ralph:*, respawn:*, etc.) don't need padding.
+    // Note: session:terminal has its own padding in flushSessionTerminalBatch().
+    const needsPadding = this._isTunnelActive && event === SseEvent.SessionNeedsRefresh;
     const padding = needsPadding ? SSE_PADDING : '';
     let message: string;
     try {