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.

CHECKPOINTS.md

@@ -6,12 +6,14 @@
 ## C2 — Estado
 - [ ] Máximo una feature en `in_progress`.
 - [ ] Estados válidos en backlog.
+- [ ] `work/runtime-status.json` válido y visible con `scripts/agent_status.py`.
 
 ## C3 — Gates
 - [ ] Toda feature `done` tiene `reviewer.json` aprobado.
 - [ ] Toda feature `done` tiene `security.json` aprobado.
 - [ ] Toda feature `done` tiene `qa.json` aprobado.
 - [ ] Toda feature `done` tiene `leader-close.json` válido.
+- [ ] Toda feature `done` tiene `documenter.md`.
 
 ## C4 — Verificación
 - [ ] `./scripts/verify.sh` termina en OK.