feat(tech/ihp-sg13g2): update user project .def files

This change moves the power rails to TopMetal1, and makes the TopMetal1 layer available for the user designs.

In addition, we now let LibreLane install the PDK instead of having to install it separately.

tech.py

@@ -2,8 +2,6 @@ import json
 import os
 from typing import Dict, List, Literal, Pattern, Protocol, Tuple, TypedDict, Union
 
-from git.repo import Repo
-
 TechName = Literal["sky130A", "ihp-sg13g2", "gf180mcuD"]
 
 
@@ -57,10 +55,12 @@ class Tech(Protocol):
         raise NotImplementedError()
 
 
-def parse_openpdks_pdk_version(sources_file: str) -> PDKVersionInfo:
+def parse_openpdks_pdk_version(
+    sources_file: str, expected_source: str = "open_pdks"
+) -> PDKVersionInfo:
     with open(sources_file) as f:
         pdk_source, pdk_version = f.read().strip().split(" ")
-        assert pdk_source == "open_pdks"
+        assert pdk_source == expected_source
         return PDKVersionInfo(source=pdk_source, version=pdk_version)
 
 
@@ -125,11 +125,11 @@ class Sky130Tech(Tech):
 
 class IHPTech(Tech):
     def_suffix = "pgvdd"
-    librelane_pdk_args = "--manual-pdk --pdk ihp-sg13g2"
+    librelane_pdk_args = "--pdk ihp-sg13g2"
     tt_corner = "nom_typ_1p20V_25C"
     cell_regexp = r"^\s*sg13g2_(?P<cell_name>\S+)_(?P<cell_drive>\d+)"
     netlist_type = "nl"
-    project_top_metal_layer = "Metal5"
+    project_top_metal_layer = "TopMetal1"
     librelane_config = {}
     label_layers = [
         (8, 1),  # Metal1.label
@@ -163,10 +163,8 @@ class IHPTech(Tech):
     logo_pixel_size = 0.25  # um
 
     def read_pdk_version(self, pdk_root: str) -> PDKVersionInfo:
-        pdk_repo = Repo(pdk_root)
-        pdk_repo_name = list(pdk_repo.remotes[0].urls)[0].split("/")[-1]
-        pdk_commit = pdk_repo.commit().hexsha
-        return PDKVersionInfo(source=pdk_repo_name, version=pdk_commit)
+        pdk_sources_file = os.path.join(pdk_root, "ihp-sg13g2", "SOURCES")
+        return parse_openpdks_pdk_version(pdk_sources_file, "IHP-Open-PDK")
 
     def load_cell_definitions(self) -> Dict[str, CellDefinition]:
         URL_FORMAT = "https://raw.githubusercontent.com/IHP-GmbH/IHP-Open-PDK/refs/heads/main/ihp-sg13g2/libs.ref/sg13g2_stdcell/doc/sg13g2_stdcell_typ_1p20V_25C.pdf#{ref}"