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_chat_history.py

@@ -0,0 +1,90 @@
+import pytest
+
+
+def _make_config():
+    from pyra.config.schema import PyraConfig, ProviderConfig
+    return PyraConfig(ai=ProviderConfig(provider_id="lmstudio", model="gemma"))
+
+
+@pytest.fixture
+def history(tmp_pyra_home, monkeypatch):
+    monkeypatch.setattr("pyra.chat.history.load_context_for_session", lambda: "")
+    from pyra.chat.history import ConversationHistory
+    return ConversationHistory(_make_config())
+
+
+def test_build_for_api_first_message_is_system(history):
+    msgs = history.build_for_api()
+    assert msgs[0]["role"] == "system"
+
+
+def test_build_for_api_system_contains_pyra(history):
+    msgs = history.build_for_api()
+    assert "Pyra" in msgs[0]["content"]
+
+
+def test_build_for_api_includes_memory_context(tmp_pyra_home, monkeypatch):
+    monkeypatch.setattr(
+        "pyra.chat.history.load_context_for_session",
+        lambda: "## Long-term Memory\n\nSome remembered facts.",
+    )
+    from pyra.chat.history import ConversationHistory
+    h = ConversationHistory(_make_config())
+    msgs = h.build_for_api()
+    assert "Long-term Memory" in msgs[0]["content"]
+
+
+def test_add_user_appears_in_api_payload(history):
+    history.add_user("hello from user")
+    msgs = history.build_for_api()
+    user_msgs = [m for m in msgs if m["role"] == "user"]
+    assert any(m["content"] == "hello from user" for m in user_msgs)
+
+
+def test_add_assistant_appears_in_api_payload(history):
+    history.add_assistant("hello from assistant")
+    msgs = history.build_for_api()
+    asst_msgs = [m for m in msgs if m["role"] == "assistant"]
+    assert any(m["content"] == "hello from assistant" for m in asst_msgs)
+
+
+def test_add_tool_result(history):
+    history.add_tool_result("call_abc", "tool output")
+    msgs = history.build_for_api()
+    tool_msgs = [m for m in msgs if m.get("role") == "tool"]
+    assert len(tool_msgs) == 1
+    assert tool_msgs[0]["tool_call_id"] == "call_abc"
+    assert tool_msgs[0]["content"] == "tool output"
+
+
+def test_clear_removes_messages(history):
+    history.add_user("hello")
+    history.add_assistant("hi")
+    history.clear()
+    msgs = history.build_for_api()
+    assert all(m["role"] == "system" for m in msgs)
+
+
+def test_trim_to_budget_drops_old_messages():
+    from pyra.chat.history import _trim_to_budget
+    msgs = [
+        {"role": "user", "content": "a" * 4000},
+        {"role": "assistant", "content": "b" * 4000},
+        {"role": "user", "content": "new message"},
+    ]
+    trimmed = _trim_to_budget(list(msgs), 100)
+    assert len(trimmed) < 3
+    assert any(m["content"] == "new message" for m in trimmed)
+
+
+def test_trim_to_budget_no_trim_when_under_budget():
+    from pyra.chat.history import _trim_to_budget
+    msgs = [{"role": "user", "content": "short"}]
+    result = _trim_to_budget(list(msgs), 10000)
+    assert len(result) == 1
+    assert result[0]["content"] == "short"
+
+
+def test_trim_to_budget_empty_list():
+    from pyra.chat.history import _trim_to_budget
+    assert _trim_to_budget([], 1000) == []