Merge remote-tracking branch 'origin/main' into feat/session-handoff-plugins

# Conflicts:
#	docs/llms.txt
#	integrations/agent-plugin-core/tests/test_build.py
#	integrations/antigravity-plugin/agents/sidekick/agent.md
#	integrations/cursor-plugin/agents/sidekick.md
#	integrations/kimi-plugin/agents/sidekick.md
#	integrations/opencode-plugin/README.md
#	integrations/pi-agent-plugin/README.md

integrations/agent-plugin-core/tests/test_build.py

@@ -63,6 +63,7 @@ def test_portable_bundle_is_conformant_and_self_contained(tmp_path: Path) -> Non
     assert "env" not in server
     assert not (root / "core" / "hook_runner.py").exists()
     assert not (root / "core" / "flush_worker.py").exists()
+    assert not (root / "agents").exists()
     for skill in (root / "skills").glob("*/SKILL.md"):
         frontmatter = skill.read_text(encoding="utf-8").split("---", 2)[1]
         keys = {line.split(":", 1)[0] for line in frontmatter.splitlines() if ":" in line}
@@ -79,6 +80,19 @@ def test_native_bundle_is_self_contained(host: str, tmp_path: Path) -> None:
     assert not any(path.is_symlink() for path in root.rglob("*"))
 
 
+@pytest.mark.parametrize("host", ["claude-code", "cursor", "codex", "kimi", "antigravity"])
+def test_only_claude_bundles_sidekick(host: str, tmp_path: Path) -> None:
+    root = build(host, "native", tmp_path / host)
+    if host == "claude-code":
+        agent = (root / "agents" / "sidekick.md").read_text()
+        assert "model: sonnet" in agent
+        assert "isolation: worktree" in agent
+    else:
+        assert not (root / "agents").exists()
+        for path in root.rglob("*.json"):
+            assert "sidekick" not in path.read_text().lower()
+
+
 @pytest.mark.parametrize("host", ["claude-code", "cursor", "codex", "kimi", "antigravity"])
 def test_native_control_skills_select_the_host_store(host: str, tmp_path: Path) -> None:
     root = build(host, "native", tmp_path / host)