M4 implementada e backlog validado

RI/agents/example_agent/backends/finance_agent/__init__.py

@@ -0,0 +1,42 @@
+"""Finance backend for the Modo A multiagent demo (EP-13-T05, ADR-024).
+
+Same shape as `backends.sales_agent` -- a thin factory around `ExampleAgent`
+bound to the `finance-payments-agent` MCP Client identity (EP-01) instead.
+See `sales_agent/__init__.py`'s module docstring for why the two backends
+share everything except identity/prompt.
+"""
+
+from __future__ import annotations
+
+from openai import AsyncOpenAI
+
+from emcp_bus.audit.sink import AuditSink
+from example_agent.agent import ExampleAgent
+
+SYSTEM_PROMPT = (
+    "You are a helpful assistant for a finance/billing team. Use only the "
+    "tools you are given -- never claim to have capabilities outside them, "
+    "and never invent a tool name that wasn't offered to you. Executing a "
+    "payment above the approval threshold always requires a human approval "
+    "before it can complete -- never tell the customer it is done until the "
+    "tool result confirms it."
+)
+
+
+def build_finance_agent(
+    *,
+    gateway_url: str,
+    bearer_token: str,
+    llm_client: AsyncOpenAI,
+    model: str,
+    audit_sink: AuditSink | None = None,
+) -> ExampleAgent:
+    return ExampleAgent(
+        gateway_url=gateway_url,
+        bearer_token=bearer_token,
+        llm_client=llm_client,
+        model=model,
+        agent_name="finance_agent",
+        system_prompt=SYSTEM_PROMPT,
+        audit_sink=audit_sink,
+    )