Make agent package optional based on installation type

Author: openhands-agent

build.py

@@ -0,0 +1,10 @@
+from hatchling.builders.hooks.plugin.interface import BuildHookInterface
+
+class CustomBuildHook(BuildHookInterface):
+    def initialize(self, version, build_data):
+        """Add agent package if not installing core-only."""
+        target = build_data['wheel']['targets'][0]
+        extras = target.get('options', {}).get('extras', [])
+        
+        if 'core' not in extras:
+            target['packages'].append('commit0.optional.agent')

commit0/optional/__init__.py

@@ -0,0 +1 @@
+"""Optional packages for commit0."""

agent/README.md renamed to commit0/optional/agent/README.md

@@ -30,10 +30,13 @@ classifiers = [
 
 [project.scripts]
 commit0 = "commit0.__main__:main"
-agent = "agent.__main__:main"
+agent = "commit0.optional.agent.__main__:main"
 
 [tool.hatch.build.targets.wheel]
-packages = ["commit0", "agent"]
+packages = ["commit0"]
+
+[tool.hatch.build.targets.wheel.hooks.custom]
+path = "build.py"
 
 [project.optional-dependencies]
 core = [