Add lifecycle, errata, internal-features, and layout_rules checks.

Cache distributor EOL/NRND/RoHS without inventing replacements, flag catalogued errata pull-ups only, and store layout_rules with a closed kind enum so millimetres stay null unless the datasheet stated a number.

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

tests/test_lifecycle_check.py

@@ -0,0 +1,98 @@
+"""Lifecycle from distributor payload.
+
+Favor: DigiKey Obsolete → PS-LF-001 WARNING and uses ProductSubstitutions;
+NRND → PS-LF-002 INFO; explicit RoHS Non-Compliant → PS-LF-003.
+Against: Active is silent; RoHS Not Applicable is not a fail; missing
+catalog row is silent; no substitution key means no invented replacement.
+"""
+
+from __future__ import annotations
+
+from backend.pinscopex.lifecycle import (
+    check_lifecycle,
+    parse_distributor_product,
+)
+from backend.pinscopex.models import Component, ComponentType, DesignGraph, Net, NetType, PinConnection
+
+
+def _graph(mpn="PARTX"):
+    u = Component(
+        reference="U1", value="", footprint="",
+        component_type=ComponentType.IC, mpn=mpn,
+        pins={"1": "VDD"},
+    )
+    return DesignGraph(
+        components={"U1": u},
+        nets={"VDD": Net(name="VDD", net_type=NetType.POWER, pins=[
+            PinConnection(component_ref="U1", pin_number="1"),
+        ])},
+    )
+
+
+def test_obsolete_is_warning_and_uses_distributor_replacement():
+    rec = parse_distributor_product("ABC", {
+        "ManufacturerProductNumber": "ABC",
+        "ProductStatus": "Obsolete",
+        "RoHSStatus": "RoHS3 Compliant",
+        "QuantityAvailable": 12,
+        "ManufacturerLeadWeeks": "8",
+        "ProductSubstitutions": [{"ManufacturerProductNumber": "ABC-B"}],
+    })
+    assert rec.lifecycle == "eol"
+    assert rec.rohs_compliant is True
+    assert rec.stock == 12
+    assert rec.replacement == "ABC-B"
+    findings = check_lifecycle(_graph("ABC"), {"ABC": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-001"
+    assert findings[0].status == "WARNING"
+    assert findings[0].source == "lifecycle_check"
+    assert "ABC-B" in (findings[0].recommendation or "")
+
+
+def test_nrnd_is_info():
+    rec = parse_distributor_product("N1", {"ProductStatus": "Not For New Designs"})
+    assert rec.lifecycle == "nrnd"
+    findings = check_lifecycle(_graph("N1"), {"N1": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-002"
+    assert findings[0].status == "INFO"
+
+
+def test_explicit_rohs_non_compliant_is_warning():
+    rec = parse_distributor_product("R1", {
+        "ProductStatus": "Active",
+        "RoHSStatus": "Non-Compliant",
+    })
+    assert rec.rohs_compliant is False
+    findings = check_lifecycle(_graph("R1"), {"R1": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-003"
+    assert findings[0].status == "WARNING"
+
+
+def test_active_is_silent():
+    rec = parse_distributor_product("A1", {"ProductStatus": "Active"})
+    assert rec.lifecycle == "active"
+    assert check_lifecycle(_graph("A1"), {"A1": rec}) == []
+
+
+def test_rohs_not_applicable_is_not_a_fail():
+    rec = parse_distributor_product("R2", {
+        "ProductStatus": "Active",
+        "RoHSStatus": "Not Applicable",
+    })
+    assert rec.rohs_compliant is None
+    assert check_lifecycle(_graph("R2"), {"R2": rec}) == []
+
+
+def test_missing_catalog_and_missing_substitute_are_not_guessed():
+    assert check_lifecycle(_graph("NOPE"), {}) == []
+    rec = parse_distributor_product("EOLX", {"ProductStatus": "Discontinued"})
+    assert rec.lifecycle == "eol"
+    assert rec.replacement is None
+    findings = check_lifecycle(_graph("EOLX"), {"EOLX": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-001"
+    assert "ABC-B" not in (findings[0].recommendation or "")
+    assert rec.replacement is None