feat(fase2): feed debate converged output into candidate generation

tests/test_vertical_slice_e2e.py

@@ -138,6 +138,37 @@ async def test_wiring_budget_middleware_and_retrieval_tool(
     assert any(isinstance(t, FunctionTool) for t in tools)
 
 
+async def test_g_validated_proposal_derives_from_debate(
+    docs_dir, make_client_factory, fresh_store, monkeypatch
+) -> None:
+    """F1: the candidate fed to generation derives from the DEBATE, not just retrieval. Spy
+    the context passed to generate_via_llm; the proposer's converged output ('Reduce scope',
+    present in _VALID but NOT in the docs_dir fixture) must reach generation. Deleting the
+    debate->generation wiring makes this fail."""
+    from portfolio_optimiser import run as run_mod
+
+    captured: dict[str, str] = {}
+    real_generate = run_mod.generate_via_llm
+
+    async def spy_generate(chat_client, project, context, meter, **kw):
+        captured["context"] = context
+        return await real_generate(chat_client, project, context, meter, **kw)
+
+    monkeypatch.setattr(run_mod, "generate_via_llm", spy_generate)
+    result = await run_project(
+        "FV42-GSV-E1",
+        "local",
+        docs_dir=docs_dir,
+        verdict_input=_VI,
+        client_factory=make_client_factory(_VALID),
+        store=fresh_store,
+    )
+    debate_marker = "Reduce scope"  # in _VALID (proposer output); NOT in docs_dir
+    assert result.debate_output and debate_marker in result.debate_output
+    assert debate_marker in captured["context"]  # debate output reached generation
+    assert isinstance(result.outcome, ValidatedProposal)
+
+
 async def test_f_malformed_contract_raises_before_any_chat(docs_dir, make_client_factory) -> None:
     calls = {"n": 0}
     base = make_client_factory(_VALID)