chore: bootstrap agnostic agent harness framework

harness/contracts/evidence.schema.json

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+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://arnes.local/evidence.schema.json",
+  "title": "Gate Evidence",
+  "type": "object",
+  "required": ["feature_id", "agent", "verdict", "summary", "evidence", "timestamp"],
+  "properties": {
+    "feature_id": { "type": "string", "minLength": 1 },
+    "agent": { "type": "string", "enum": ["reviewer", "security", "qa", "leader"] },
+    "verdict": { "type": "string", "enum": ["APPROVED", "CHANGES_REQUESTED"] },
+    "summary": { "type": "string", "minLength": 1 },
+    "evidence": {
+      "type": "array",
+      "items": { "type": "string", "minLength": 1 }
+    },
+    "timestamp": { "type": "string", "format": "date-time" }
+  },
+  "additionalProperties": true
+}

harness/contracts/handoff.md

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+# Handoff Contract
+
+## Regla anti teléfono-descompuesto
+Los agentes **no** devuelven código en chat. Deben escribir a disco y responder solo:
+- `done -> <ruta>`
+- `blocked -> <ruta>`
+
+## Rutas estándar por feature
+- `work/artifacts/<feature_id>/implementer.md`
+- `work/artifacts/<feature_id>/reviewer.json`
+- `work/artifacts/<feature_id>/security.json`
+- `work/artifacts/<feature_id>/qa.json`
+- `work/artifacts/<feature_id>/leader-close.json`
+
+## Campos mínimos de artefactos JSON de gate
+- `feature_id` (string)
+- `agent` (reviewer|security|qa|leader)
+- `verdict` (APPROVED|CHANGES_REQUESTED)
+- `summary` (string)
+- `evidence` (array de comandos/salidas/rutas)
+- `timestamp` (ISO 8601)