chore(agents): sync agent configs — model updates to nemotron-3-super

- Update agent model assignments (nemotron-3-ultra -> nemotron-3-super) across .kilo/agents, kilo-meta.json, kilo.jsonc, capability-index.yaml
- Sync agent descriptions in KILO_SPEC.md

.kilo/agents/browser-automation.md

@@ -1,7 +1,7 @@
 ---
 description: Browser automation agent using Playwright MCP for E2E testing, form filling, navigation, and web interaction
 mode: all
-model: ollama-cloud/kimi-k2.7-code
+model: ollama-cloud/nemotron-3-super
 variant: thinking
 permission:
   read: allow