build(fase2): promote orchestrations + pulp to core deps

tests/test_imports_core.py

@@ -0,0 +1,23 @@
+"""Step 1 import smoke (core deps): the GA orchestration builders + the PuLP solver are
+now MVP-runtime dependencies (promoted from ``dev`` into ``[project.dependencies]``), and
+PuLP's bundled CBC solver is available on this platform.
+
+Pattern: tests/spikes/test_imports.py (plain functions, no fixtures).
+"""
+
+import warnings
+
+
+def test_core_runtime_deps_importable_and_cbc_available() -> None:
+    # Promoted from [dev] to [project.dependencies] in Fase 2 — now MVP-runtime, not dev-only.
+    from agent_framework.orchestrations import GroupChatBuilder  # noqa: F401
+    import pulp
+
+    # CBC ships in PuLP's wheel; the deterministic validator hard-depends on it (no silent
+    # LP-relaxation fallback). PULP_CBC_CMD is the only handle to the bundled binary
+    # (PuLP 4.0 will require pulp[cbc] + COIN_CMD — a future migration note).
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore", DeprecationWarning)
+        # PuLP 3.3.2's available() returns the resolved CBC binary PATH (a truthy str) when
+        # present, not the bool True — so assert truthiness, not identity.
+        assert pulp.PULP_CBC_CMD(msg=False).available()