chore(agents): sync agent configs, models, capability index; cleanup junk

- Update agent model assignments (minimax/glm -> nemotron-3-ultra, kimi-k2.7-code, qwen3.5:397b) in .kilo/agents, kilo-meta.json, kilo.jsonc, capability-index.yaml
- Update orchestrator/agent prompts (complexity fast-path, verification tests, close-loop audit)
- Add .kilo/KILO_SPEC.md (Kilo Code specification reference)
- AGENTS.md: consolidate smartadmin agent rows
- Remove screenshot-dash.cjs (unused, contained hardcoded admin token); gitignore it
- Remove empty .kilo/milestones/

.kilo/agents/intake-agent.md

@@ -1,7 +1,7 @@
 ---
 description: Conversational interface — receives natural language from users, clarifies ambiguous requirements, produces structured tasks for orchestrator
 mode: all
-model: ollama-cloud/minimax-m2.7
+model: ollama-cloud/nemotron-3-ultra
 variant: thinking
 color: "#0891B2"
 permission: