test: add comprehensive coverage for cli, chat, renderer, dirs, install, paths

56 new tests covering previously untested modules:
- test_cli.py: memory write/read/append/list + plugin enable/disable + daemon stubs (via CliRunner)
- test_chat_history.py: ConversationHistory build_for_api, add_*/clear, _trim_to_budget
- test_chat_renderer.py: render_text_response return values, void render_* functions
- test_config_dirs.py: bootstrap idempotency, directory/template/vault/db creation
- test_plugin_install.py: list_bundled_plugins, read_manifest, install_bundled_plugin
- test_utils_paths.py: ensure_dir (nested, idempotent), safe_chmod

Total: 171 → 227 passing tests.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/test_plugin_install.py

@@ -0,0 +1,121 @@
+import json
+import os
+import pytest
+
+from pyra.plugins.install import (
+    get_bundled_plugins_dir,
+    install_bundled_plugin,
+    list_bundled_plugins,
+    read_manifest,
+)
+
+
+def test_get_bundled_plugins_dir_name():
+    d = get_bundled_plugins_dir()
+    assert d.name == "bundled_plugins"
+    assert d.parent.name == "pyra"
+
+
+def test_list_bundled_plugins_empty_dir(tmp_path):
+    bundled = tmp_path / "bundled"
+    bundled.mkdir()
+    assert list_bundled_plugins(bundled) == []
+
+
+def test_list_bundled_plugins_missing_dir(tmp_path):
+    assert list_bundled_plugins(tmp_path / "nonexistent") == []
+
+
+def test_list_bundled_plugins_with_manifest(tmp_path):
+    bundled = tmp_path / "bundled"
+    plugin = bundled / "myplugin"
+    plugin.mkdir(parents=True)
+    (plugin / "manifest.json").write_text('{"name": "myplugin", "version": "1.0"}')
+    assert list_bundled_plugins(bundled) == ["myplugin"]
+
+
+def test_list_bundled_plugins_without_manifest(tmp_path):
+    bundled = tmp_path / "bundled"
+    (bundled / "myplugin").mkdir(parents=True)
+    assert list_bundled_plugins(bundled) == []
+
+
+def test_list_bundled_plugins_sorted(tmp_path):
+    bundled = tmp_path / "bundled"
+    for name in ["zebra", "alpha", "mango"]:
+        p = bundled / name
+        p.mkdir(parents=True)
+        (p / "manifest.json").write_text("{}")
+    result = list_bundled_plugins(bundled)
+    assert result == sorted(result)
+
+
+def test_read_manifest_valid(tmp_path):
+    plugin_dir = tmp_path / "myplugin"
+    plugin_dir.mkdir()
+    (plugin_dir / "manifest.json").write_text(
+        json.dumps({"name": "myplugin", "version": "1.0.0", "description": "Test plugin"})
+    )
+    manifest = read_manifest(plugin_dir)
+    assert manifest["name"] == "myplugin"
+    assert manifest["version"] == "1.0.0"
+    assert manifest["description"] == "Test plugin"
+
+
+def test_read_manifest_missing(tmp_path):
+    plugin_dir = tmp_path / "myplugin"
+    plugin_dir.mkdir()
+    assert read_manifest(plugin_dir) == {}
+
+
+def test_install_bundled_plugin_not_found(tmp_path):
+    bundled = tmp_path / "bundled"
+    bundled.mkdir()
+    plugins = tmp_path / "plugins"
+    plugins.mkdir()
+    with pytest.raises(FileNotFoundError):
+        install_bundled_plugin("nonexistent", bundled, plugins)
+
+
+def test_install_bundled_plugin_missing_manifest(tmp_path):
+    bundled = tmp_path / "bundled"
+    (bundled / "myplugin").mkdir(parents=True)
+    (bundled / "myplugin" / "plugin.py").write_text("# stub")
+    plugins = tmp_path / "plugins"
+    plugins.mkdir()
+    with pytest.raises(FileNotFoundError):
+        install_bundled_plugin("myplugin", bundled, plugins)
+
+
+def test_install_bundled_plugin_success(tmp_path):
+    bundled = tmp_path / "bundled"
+    src = bundled / "myplugin"
+    src.mkdir(parents=True)
+    (src / "manifest.json").write_text('{"name": "myplugin", "version": "1.0"}')
+    (src / "plugin.py").write_text("# stub plugin")
+
+    plugins = tmp_path / "plugins"
+    plugins.mkdir()
+
+    install_bundled_plugin("myplugin", bundled, plugins)
+
+    dest = plugins / "myplugin"
+    assert dest.is_dir()
+    assert (dest / "manifest.json").exists()
+    assert (dest / "plugin.py").exists()
+    if os.name != "nt":
+        assert oct((dest / "plugin.py").stat().st_mode)[-3:] == "600"
+
+
+def test_install_bundled_plugin_overwrites(tmp_path):
+    bundled = tmp_path / "bundled"
+    src = bundled / "myplugin"
+    src.mkdir(parents=True)
+    (src / "manifest.json").write_text('{"name": "myplugin", "version": "1.0"}')
+
+    plugins = tmp_path / "plugins"
+    plugins.mkdir()
+
+    install_bundled_plugin("myplugin", bundled, plugins)
+    install_bundled_plugin("myplugin", bundled, plugins)  # second install should not raise
+    assert (plugins / "myplugin").is_dir()