Register library components from a datasheet without an exam (2.63.1).

POST /api/library/datasheets now writes an IC inbox card or a
passive/discrete model. Empty pintables never enter library/extracted.
AF Board+AI runs after unchanged run_pcb_checks (PE-SI / HF line stay).

tests/af_ai/test_af_ai_hf.py

@@ -5,7 +5,12 @@ Does not replace run_pcb_checks. Not DRC. Never invents Z.
 
 from __future__ import annotations
 
-from backend.periscopex.af_ai_hf import HfHypothesis, investigate_hf_hypotheses
+from backend.periscopex.af_ai_hf import (
+    HfHypothesis,
+    append_investigated,
+    hypotheses_from_rows,
+    investigate_hf_hypotheses,
+)
 from backend.periscopex.hf_line_check import check_hf_lines
 from backend.periscopex.models import (
     Component,
@@ -144,3 +149,57 @@ def test_z0_with_stackup_does_not_invent_ohm_number():
     for f in out:
         assert "50 Ω" not in (f.finding or "")
         assert "90 Ω" not in (f.finding or "")
+
+
+def test_append_investigated_keeps_pcb_checks_and_adds_pe_af():
+    graph = _usb_graph()
+    layout = _stub_layout()
+    cons = _stub_constraints()
+    pcb = run_pcb_checks(graph, cons, layout)
+    n_si = sum(1 for f in pcb if f.rule_id == "PE-SI-007")
+    assert n_si >= 1
+    flags = [
+        HfHypothesis(net="USB_D+", issue_class="stub", why="looks long"),
+        HfHypothesis(net="USB_D+", issue_class="z0", why="probably 90 ohm"),
+    ]
+    added = append_investigated(pcb, graph, cons, layout, flags)
+    assert any(f.rule_id == "PE-AF-001" for f in added)
+    assert sum(1 for f in pcb if f.rule_id == "PE-SI-007") == n_si
+    assert "si_check" in _pcb_checks_source()
+    assert "hf_line" in _pcb_checks_source()
+
+
+def test_hypotheses_from_rows_drops_unknown_class():
+    rows = [
+        {"net": "USB_D+", "issue_class": "stub", "why": "x"},
+        {"net": "USB_D+", "issue_class": "clearance", "why": "drc"},
+        {"net": "", "issue_class": "z0", "why": "empty"},
+    ]
+    hyps = hypotheses_from_rows(rows)
+    assert len(hyps) == 1
+    assert hyps[0].issue_class == "stub"
+
+
+def test_pcb_pipeline_af_ai_is_after_run_pcb_checks():
+    import inspect
+
+    from backend.periscopex import pcb_checks
+    from backend.services import pcb_pipeline
+
+    src = inspect.getsource(pcb_pipeline.run_pcb_pipeline)
+    assert "run_pcb_checks" in src
+    assert "_run_af_ai_section" in src
+    assert src.find("run_pcb_checks") < src.find("_run_af_ai_section")
+    checks = inspect.getsource(pcb_checks.run_pcb_checks)
+    assert '("si_check"' in checks or '"si_check"' in checks
+    assert '"hf_line"' in checks
+    assert "af_ai" not in checks
+    assert "investigate_hf_hypotheses" not in checks
+
+
+def _pcb_checks_source() -> str:
+    import inspect
+
+    from backend.periscopex.pcb_checks import run_pcb_checks
+
+    return inspect.getsource(run_pcb_checks)