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/markdown-validator.md

@@ -1,9 +1,10 @@
 ---
 description: Validates and corrects Markdown descriptions for Gitea issues
 mode: subagent
-model: ollama-cloud/minimax-m2.5
+model: ollama-cloud/nemotron-3-ultra
 variant: thinking
 permission:
+  bash: ask
   read: allow
   edit: allow
   write: allow