Link support codes to agent sessions

- Server: Accept support_code param in WebSocket connection
- Server: Link code to session when agent connects, mark as connected
- Server: Mark code as completed when agent disconnects
- Agent: Accept support code from command line argument
- Agent: Send hostname and support_code in WebSocket params
- Portal: Trigger agent download with code in filename
- Portal: Show code reminder in download instructions
- Dashboard: Add machines list fetching (Access tab)
- Add TODO.md for feature tracking

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server/static/index.html

@@ -381,16 +381,26 @@
             // Show instructions
             showInstructions();
 
-            // For now, show a message that download will be available soon
-            // TODO: Implement actual download endpoint
             setLoading(false);
             connectBtn.querySelector('.btn-text').textContent = 'Download Starting...';
 
-            // Placeholder - in production this will download the agent
+            // Create a temporary link to download the agent
+            // The agent will be run with the code as argument
+            const downloadLink = document.createElement('a');
+            downloadLink.href = '/guruconnect-agent.exe';
+            downloadLink.download = 'GuruConnect-' + code + '.exe';
+            document.body.appendChild(downloadLink);
+            downloadLink.click();
+            document.body.removeChild(downloadLink);
+
+            // Show instructions with the code reminder
             setTimeout(() => {
-                alert('Agent download will be available once the agent is built.\n\nSession ID: ' + sessionId);
-                connectBtn.querySelector('.btn-text').textContent = 'Connect';
-            }, 1000);
+                connectBtn.querySelector('.btn-text').textContent = 'Run the Downloaded File';
+
+                // Update instructions to include the code
+                instructionsList.innerHTML = getBrowserInstructions(detectBrowser()).map(step => '<li>' + step + '</li>').join('') +
+                    '<li><strong>Important:</strong> When prompted, enter code: <strong style="color: hsl(var(--primary)); font-size: 18px;">' + code + '</strong></li>';
+            }, 500);
         }
 
         function showError(message) {