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.

harness/models.profiles.yml

@@ -0,0 +1,51 @@
+version: 1
+
+policy:
+  goal: "Use smallest model that can do task well"
+  fallback_order: ["tiny", "small", "medium", "large"]
+
+profiles:
+  tiny:
+    use_for:
+      - status updates
+      - file moves
+      - boilerplate JSON
+      - simple docs formatting
+  small:
+    use_for:
+      - triage ticket drafting
+      - reviewer/security/qa short verdicts
+      - changelog/doc updates
+      - refactors with low logic risk
+  medium:
+    use_for:
+      - architecture decisions
+      - non-trivial implementation
+      - multi-file integration changes
+  large:
+    use_for:
+      - complex debugging
+      - deep root-cause analysis
+      - migrations with high risk
+      - ambiguous requirements
+
+role_defaults:
+  leader: small
+  triager: small
+  architect: medium
+  implementer: medium
+  reviewer: small
+  security: small
+  qa: small
+  documenter: tiny
+
+stage_overrides:
+  triage_translate: small
+  intake: small
+  design: medium
+  build: medium
+  review_gate: small
+  security_gate: small
+  qa_gate: small
+  documentation_gate: tiny
+  close: small