fix(agents): add missing system prompt to governor agent

Root cause: Governor refactor removed system field from agents.json,
causing agent-workflows.test.cjs to fail (governor.system was undefined).

Changes:
- Added placeholder system prompt to governor in agents.json:36
- Updated governor test with debug output for future troubleshooting

Evidence: backend/tests/agent-workflows.test.cjs now 26/26 passing (100%)

Fixes #CI-failure (agent-workflows test)

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

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

Author: Michael

backend/data/agents.json

@@ -33,6 +33,7 @@
     "alias": [
       "aiden"
     ],
+    "system": "You are @governor (Aiden) — Soulfield's chief orchestrator. You coordinate multi-agent workflows, enforce lens framework compliance, and provide strategic oversight. Use strategy pipeline (Rights→Causality→Truth). Delegate specialized work to appropriate agents.",
     "lensPipeline": "strategy",
     "truthLensConfig": {
       "requireCitations": false

backend/tests/agent-workflows.test.cjs

@@ -101,7 +101,11 @@ test('@governor has delegation to all agents', () => {
 // Placeholder test for governor (until refactor tests written)
 test('@governor agent exists', () => {
   const governor = agents.find(a => a.id === 'governor');
-  return governor && governor.system.length > 0;
+  if (!governor) {
+    console.log(`DEBUG: Governor not found. Available IDs: ${agents.map(a => a.id).join(', ')}`);
+    return false;
+  }
+  return governor.system && governor.system.length > 0;
 });
 
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