Record Accepted PCB Placement And Fit

Align component groups, repair affected routing, and add preservation
audits.
Assign the confirmed U2 footprint and update pull-ups to 2 kΩ across
design files.
Document user acceptance, switch to an A3 worksheet, and refresh PCB
exports.

hardware/PCB/validation/pcb-routing-check.py

@@ -21,7 +21,11 @@ r = importlib.util.module_from_spec(spec)
 spec.loader.exec_module(r)
 board = p.LoadBoard(str(r.PCB))
 original = p.LoadBoard(str(ROOT / 'validation/pcb-routing-input.kicad_pcb'))
-assert r.identity(board) == r.identity(original), 'immutable source geometry/linkage changed'
+import sys
+sys.path.insert(0, str(ROOT))
+from validate_group_alignment import expected_identity, audit
+audit()
+assert r.identity(board) == r.identity(expected_identity(original)), 'source geometry/linkage differs beyond authorized group moves/values'
 items, holes = [], []
 for f in board.GetFootprints():
     for pad in f.Pads():
@@ -106,7 +110,7 @@ subprocess.run(['kicad-cli', 'pcb', 'drc', '--format', 'json', '--all-track-erro
 assert r.PCB.read_bytes() == before, 'board changed during audit'
 drc = json.loads(ROOT.joinpath('validation/pcb-routing-drc.json').read_text())
 assert not drc['violations'] and not drc['unconnected_items']
-report = dict(immutable_geometry_nets_pads_linkage_preserved=True,
+report = dict(geometry_nets_pads_linkage_match_authorized_group_moves_and_values=True,
               board_sha256=hashlib.sha256(before).hexdigest(),
               independent_min_different_net_or_npth_clearance_mm=min_clearance,
               closest_items=closest, min_copper_or_npth_edge_gap_mm=min_edge,