verify(P12): split-contract-resolver — 4-layer verify PASS + ship

VERIFY: structural — 2 modules extracted + re-export shim (G-113); behavioral — 16 tests + CLI + CI PASS; quality — behavior unchanged.

---ci---
project: acdl
phase: 12
milestone: v1.16
status: complete
phase_role: execution
requirements:
  covered: [REQ-176]
  partial: []
---/ci---

core/contract_resolver.py

@@ -437,24 +437,9 @@ def _namespace_resources(resources, module_name):
 
 
 def decommission_transform(stack_instance):
-    """REQ-92: Transform a resolved stack instance for decommission.
-
-    Sets all scalable counts to 0 and deletion_protection to false on
-    every resource. Used by the decommission pipeline mode after the
-    first step (disable deletion protection) has been applied.
-    """
-    for res in stack_instance.get("resources", []):
-        if "nfrs" not in res:
-            res["nfrs"] = {}
-        res["nfrs"]["deletion_protection"] = False
-        inputs = res.get("inputs", {})
-        if "desired_count" in inputs:
-            inputs["desired_count"] = 0
-        if "min_capacity" in inputs:
-            inputs["min_capacity"] = 0
-        if "max_capacity" in inputs:
-            inputs["max_capacity"] = 0
-    return stack_instance
+    """REQ-92: re-export from core.decommission_transform (P12, REQ-176)."""
+    from core.decommission_transform import decommission_transform as _dt
+    return _dt(stack_instance)
 
 
 def resolve(contract_path, repo_root=None, environment_override=None):
@@ -610,20 +595,6 @@ def resolve(contract_path, repo_root=None, environment_override=None):
 
 
 if __name__ == "__main__":
-    if len(sys.argv) < 3:
-        print("usage: contract_resolver.py <contract.yml> <out.json> [--environment <name>]", file=sys.stderr)
-        sys.exit(2)
-    contract_path = sys.argv[1]
-    out_path = sys.argv[2]
-    env_override = None
-    if "--environment" in sys.argv:
-        idx = sys.argv.index("--environment")
-        if idx + 1 < len(sys.argv):
-            env_override = sys.argv[idx + 1]
-    # Also honor the NOVA_ENVIRONMENT_OVERRIDE env var (used by run_platform.sh).
-    # Dual-read via core/env.py: NOVA_* preferred, ACDL_* fallback until P5.
-    if env_override is None and env.get_env("ENVIRONMENT_OVERRIDE"):
-        env_override = env.get_env("ENVIRONMENT_OVERRIDE")
-    result = resolve(contract_path, environment_override=env_override)
-    with open(out_path, "w") as fh:
-        json.dump(result, fh, indent=2)
+    # P12 (REQ-176): CLI extracted to core/contract_resolver_cli.py.
+    from core.contract_resolver_cli import main
+    sys.exit(main())

core/contract_resolver_cli.py

@@ -0,0 +1,41 @@
+"""Nova Contract Resolver CLI — command-line entry point.
+
+Extracted from core/contract_resolver.py (P12, REQ-176).
+
+G-113 import direction: this module imports core.contract_resolver (the
+re-export shim) for the resolve function. The shim imports the split
+modules. Nothing imports this CLI module except direct invocation.
+"""
+from __future__ import annotations
+
+import json
+import sys
+
+from core.contract_resolver import resolve
+from core import env
+
+
+def main(argv=None):
+    """CLI: resolve a contract YAML to a Target Stack JSON."""
+    argv = argv if argv is not None else sys.argv[1:]
+    if len(argv) < 2:
+        print("usage: contract_resolver.py <contract.yml> <out.json> [--environment <name>", file=sys.stderr)
+        return 2
+    contract_path = argv[0]
+    out_path = argv[1]
+    env_override = None
+    if "--environment" in argv:
+        idx = argv.index("--environment")
+        if idx + 1 < len(argv):
+            env_override = argv[idx + 1]
+    # Also honor the NOVA_ENVIRONMENT_OVERRIDE env var (used by run_platform.sh).
+    if env_override is None and env.get_env("ENVIRONMENT_OVERRIDE"):
+        env_override = env.get_env("ENVIRONMENT_OVERRIDE")
+    result = resolve(contract_path, environment_override=env_override)
+    with open(out_path, "w") as fh:
+        json.dump(result, fh, indent=2)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

core/decommission_transform.py

@@ -0,0 +1,31 @@
+"""Nova Decommission Transform — zero counts + disable deletion protection (REQ-92).
+
+Extracted from core/contract_resolver.py (P12, REQ-176).
+
+G-113 import direction: this module imports only stdlib. The re-export
+shim core/contract_resolver.py imports this module. Nothing imports the
+shim except external callers.
+"""
+
+from __future__ import annotations
+
+
+def decommission_transform(stack_instance):
+    """REQ-92: Transform a resolved stack instance for decommission.
+
+    Sets all scalable counts to 0 and deletion_protection to false on
+    every resource. Used by the decommission pipeline mode after the
+    first step (disable deletion protection) has been applied.
+    """
+    for res in stack_instance.get("resources", []):
+        if "nfrs" not in res:
+            res["nfrs"] = {}
+        res["nfrs"]["deletion_protection"] = False
+        inputs = res.get("inputs", {})
+        if "desired_count" in inputs:
+            inputs["desired_count"] = 0
+        if "min_capacity" in inputs:
+            inputs["min_capacity"] = 0
+        if "max_capacity" in inputs:
+            inputs["max_capacity"] = 0
+    return stack_instance