refactor: complete bootstrap of ARNES agent harness framework

- Add complete agent harness structure with 8 roles (leader, triager, architect, implementer, reviewer, security, qa, documenter)
- Implement strict workflow with 9 stages and mandatory gates
- Add comprehensive verification script and runtime status tracking
- Create artifact-based evidence system with contracts and schemas
- Add agent policy matrix with permissions and anti-cheat rules
- Include test suite (44 tests passing) and CI-ready structure
- Add documentation: README, HOWTO, CHECKPOINTS, templates
- Configure model routing policies and token-aware task assignment
- Add BDD/SDD specification guides and feature templates
- Include starter pack for quick project onboarding

All verification checks pass. Framework ready for production use.

starter-pack/README.md

@@ -0,0 +1,26 @@
+# Starter Pack (rápido)
+
+Este pack sirve para arrancar ARNES en 2 escenarios:
+
+## A) Proyecto nuevo (greenfield)
+1. Crea repo vacío.
+2. Copia el template ARNES.
+3. Ajusta `backlog/features.json` (`project`, `description`).
+4. Copia `starter-pack/backlog.features.bootstrap.json` como primera feature.
+5. Ejecuta:
+   - `./scripts/verify.sh`
+   - `python3 scripts/agent_status.py show`
+
+## B) Proyecto ya empezado (brownfield)
+1. Copia **solo** carpetas core ARNES: `harness/`, `spec/`, `backlog/`, `work/`, `scripts/`, `platforms/`.
+2. Mantén tu código actual intacto.
+3. Añade checks del dominio en `scripts/verify.local.sh`.
+4. Define features reales del proyecto en `backlog/features.json`.
+5. Ejecuta:
+   - `./scripts/verify.sh`
+   - `python3 scripts/agent_status.py show`
+
+## Reglas mínimas
+- 1 sola feature en `in_progress`.
+- `done` requiere gates: `review/security/qa`.
+- Evidencia en `work/artifacts/<feature_id>/`.