Add parallel Placement pipeline for routing-first topology plans.

Ship a free, analysis-independent job that writes placement_plan.json (domains/satellites, no mm) with API, SSE progress, and a minimal project UI.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_functional_groups.py

@@ -56,3 +56,11 @@ def test_domains_cover_all_ics():
     covered = {r for d in report.domains for r in d.ic_refs}
     assert covered == {"U1", "U2", "U3"}
     assert all(d.assemble_order for d in report.domains)
+
+
+def test_build_placement_plan_alias():
+    from backend.pinscopex.functional_groups import build_placement_plan
+    report = build_placement_plan(_graph())
+    assert report.objective == "routing"
+    assert {g.ref for g in report.groups} >= {"U1", "U2", "U3"}
+

tests/test_placement_pipeline.py

@@ -0,0 +1,52 @@
+"""Placement pipeline smoke — topology only, no LLM."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from backend.pinscopex.functional_groups import (
+    FunctionalGroupsReport,
+    build_placement_plan,
+)
+from backend.pinscopex.models import DesignGraph
+
+
+ROOT = Path(__file__).resolve().parents[1]
+SIMPLE = ROOT / "simple_project"
+
+
+@pytest.fixture
+def graph() -> DesignGraph:
+    path = SIMPLE / "design_graph.json"
+    return DesignGraph.model_validate_json(path.read_text(encoding="utf-8"))
+
+
+def test_placement_plan_writes_domains_and_groups(graph: DesignGraph, tmp_path: Path):
+    plan = build_placement_plan(graph)
+    assert plan.objective == "routing"
+    assert plan.domains
+    assert plan.groups
+    out = tmp_path / "placement_plan.json"
+    out.write_text(plan.model_dump_json(indent=2) + "\n")
+    loaded = FunctionalGroupsReport.model_validate_json(out.read_text())
+    assert len(loaded.groups) == len(plan.groups)
+
+
+def test_placement_busy_helpers():
+    from backend.services.projects import ProjectMeta, STATUS_QUEUED, STATUS_RUNNING
+
+    # Mirror placement_pipeline helpers without importing the worker stack
+    # (that pulls Anthropic via services.pipeline in lean test envs).
+    active = frozenset({"queued", "running"})
+    analysis = frozenset({STATUS_QUEUED, STATUS_RUNNING})
+
+    draft = ProjectMeta(id="p", name="t", created="2026-01-01", user_id="u")
+    assert (draft.placement_status or "draft") not in active
+    assert draft.status not in analysis
+
+    draft.placement_status = "queued"
+    assert (draft.placement_status or "draft") in active
+    draft.status = STATUS_RUNNING
+    assert draft.status in analysis