chore: scaffolding inicial del repo (pyproject, requirements, Makefile)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env.example

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+# Proveedor LLM activo. Valores: mock | azure | openai
+LLM_PROVIDER=mock
+
+# Proveedor de fallback (opcional). Vacío deshabilita fallback.
+LLM_FALLBACK_PROVIDER=
+
+# Azure OpenAI (solo si LLM_PROVIDER=azure)
+AZURE_OPENAI_ENDPOINT=
+AZURE_OPENAI_API_KEY=
+AZURE_OPENAI_DEPLOYMENT=
+AZURE_OPENAI_API_VERSION=2024-08-01-preview
+
+# OpenAI (solo si LLM_PROVIDER=openai)
+OPENAI_API_KEY=
+OPENAI_MODEL=gpt-4o
+
+# Guardrails
+GUARDRAILS_NEMO_ENABLED=false
+
+# Observabilidad
+LOG_LEVEL=INFO
+
+# Persistencia
+DATA_DIR=./data
+
+# URL del core (la usa el dashboard)
+AGENTFORGE_CORE_URL=http://core:8000