Add LFE5U-45F-8BG381I (SamacSys) and IS66WVE4M16EBLL-70BLI symbols

- Import LFE5U-45F-8BG381I as a proper named/valued SamacSys symbol
  (symbol, footprint, 3D model) instead of relying on the generic
  ECP5U_45_CABGA381 placeholder, so it's findable by exact MPN in the
  Symbol Chooser. Dedupe the vendor STEP file (byte-identical to the
  one already added for the BG381 package) and repoint the footprint's
  bare, unresolvable "LFE5U-45F-8BG381I.stp" model reference to
  ${KIPRJMOD}/3dmodels/fpga_cpld/LFE5U-45F-8BG381I.step.
- Also make the existing 9-unit ECP5U_45_CABGA381 symbol (split by
  bank, easier to use on a schematic than the flat SamacSys one)
  findable under the same MPN: Value/manf# set to LFE5U-45F-8BG381I
  after verifying its 381 CABGA381 ball assignments match the SamacSys
  symbol 1:1, and link its Footprint to the newly imported footprint.
- Import IS66WVE4M16EBLL-70BLI (SamacSys) symbol, footprint and 3D
  model.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013gndCxJXQfouCQy4hP7NSX

symbols/fpga_cpld/Lattice_ECP_FPGA.kicad_sym

@@ -4837,7 +4837,7 @@
 				(justify right)
 			)
 		)
-		(property "Value" "ECP5U_45_CABGA381"
+		(property "Value" "LFE5U-45F-8BG381I"
 			(at 3.81 3.81 0)
 			(show_name no)
 			(do_not_autoplace no)
@@ -4848,7 +4848,7 @@
 				(justify right)
 			)
 		)
-		(property "Footprint" ""
+		(property "Footprint" "MIKILAB_LFE5U_45F_8BG381I:BGA381C80P20X20_1700X1700X176"
 			(at 3.81 1.27 0)
 			(show_name no)
 			(do_not_autoplace no)
@@ -4872,7 +4872,7 @@
 				(justify right)
 			)
 		)
-		(property "Description" ""
+		(property "Description" "Lattice ECP5U-45 FPGA, CABGA381 package (LFE5U-45F-8BG381I) -- 9-unit split alternative to the flat SamacSys symbol in MIKILAB_LFE5U_45F_8BG381I"
 			(at 0 0 0)
 			(show_name no)
 			(do_not_autoplace no)
@@ -4883,7 +4883,7 @@
 				)
 			)
 		)
-		(property "manf#" "ECP5U_45"
+		(property "manf#" "LFE5U-45F-8BG381I"
 			(at 3.81 -1.27 0)
 			(show_name no)
 			(do_not_autoplace no)