fix(chat-bridge): resolve agent file from WORKSPACE_ROOT, not session cwd

Ticket threads pass workspace_path (e.g. workspace/personal/) as the
session cwd. loadAgentFile was building the path relative to that cwd,
so it looked for .claude/agents/ inside the ticket's folder instead of
the workspace root — always failing for every agent.

Fix: try WORKSPACE_ROOT/.claude/agents/{name}.md first, fall back to
cwd for custom per-directory agents.

Affected: kai-personal-assistant, flux-finance, and any ticket with
a workspace_path set.

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

Author: Davidson Gomes

dashboard/terminal-server/src/chat-bridge.js

@@ -48,7 +48,10 @@ const NEEDS_APPROVAL = new Set([
  * Extracts YAML frontmatter for metadata and the body as the prompt.
  */
 function loadAgentFile(agentName, cwd) {
-  const agentPath = path.join(cwd, '.claude', 'agents', `${agentName}.md`);
+  // Agent definitions live at the workspace root — cwd varies per ticket session.
+  const rootPath = path.join(WORKSPACE_ROOT, '.claude', 'agents', `${agentName}.md`);
+  const cwdPath = path.join(cwd, '.claude', 'agents', `${agentName}.md`);
+  const agentPath = fs.existsSync(rootPath) ? rootPath : cwdPath;
   if (!fs.existsSync(agentPath)) {
     console.warn(`[chat-bridge] Agent file not found: ${agentPath}`);
     return null;