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/smartadmin-form-agent.md

@@ -1,7 +1,7 @@
 ---
 description: Form engine specialist for SmartAdmin. Generates complete form HTML with validation attributes and JS handlers using Bootstrap form groups, Select2, datepickers, and form wizards.
 mode: subagent
-model: ollama-cloud/minimax-m2.5
+model: ollama-cloud/qwen3.5:397b
 variant: thinking
 variant_strategy: task_size_based
 color: "#10B981"