feat(oar): report installed version

Author: johnnygreco

projects/openshell-agent-runner/docs/reference.md

@@ -10,6 +10,7 @@ agent_markdown: true
 
 | Command | Purpose |
 | --- | --- |
+| `oar --version` | Display the installed OAR version. |
 | `oar init PROFILE_ROOT --model MODEL_ID` | Create editable copies of the packaged profiles. |
 | `oar validate PROFILE_DIRECTORY` | Check the profile and its local resources. |
 | `oar doctor` | Display the OpenShell version, gateway status, and inference configuration. |

projects/openshell-agent-runner/src/openshell_agent_runner/cli.py

@@ -6,6 +6,8 @@
 from __future__ import annotations
 
 import shlex
+from importlib.metadata import PackageNotFoundError
+from importlib.metadata import version as distribution_version
 from pathlib import Path
 from typing import Annotated, NoReturn
 
@@ -20,6 +22,14 @@
 from openshell_agent_runner.profile_init import ThinkingLevel, initialize_profiles
 from openshell_agent_runner.runner import RunRequest, render_dry_run, run_agent
 
+
+def version_callback(value: bool) -> None:
+    """Print the installed OAR version when requested."""
+    if value:
+        typer.echo(f"oar {_installed_version()}")
+        raise typer.Exit()
+
+
 app = typer.Typer(
     help="Launch ephemeral agents for single tasks in OpenShell sandboxes.",
     no_args_is_help=True,
@@ -28,6 +38,21 @@
 )
 
 
+@app.callback()
+def main(
+    version: Annotated[
+        bool | None,
+        typer.Option(
+            "--version",
+            callback=version_callback,
+            is_eager=True,
+            help="Show the installed OAR version and exit.",
+        ),
+    ] = None,
+) -> None:
+    """Launch ephemeral agents for single tasks in OpenShell sandboxes."""
+
+
 class ProfileTaskHelpCommand(TyperCommand):
     """Show focused help when a profile task is selected."""
 
@@ -215,6 +240,13 @@ def _fail(error: OarError) -> NoReturn:
     raise typer.Exit(1)
 
 
+def _installed_version() -> str:
+    try:
+        return distribution_version("openshell-agent-runner")
+    except PackageNotFoundError:
+        return "unknown"
+
+
 def _profile_task_selection(args: list[str]) -> tuple[Path, str] | None:
     if not args or args[0].startswith("-"):
         return None

projects/openshell-agent-runner/tests/test_cli.py

@@ -2,6 +2,8 @@
 # SPDX-License-Identifier: Apache-2.0
 
 import shutil
+from importlib.metadata import PackageNotFoundError
+from importlib.metadata import version as distribution_version
 from pathlib import Path
 
 import pytest
@@ -28,6 +30,30 @@ def test_root_help_lists_commands() -> None:
     assert result.exit_code == 0
     for command in ("init", "validate", "run", "doctor"):
         assert command in result.stdout
+    assert "--version" in result.stdout
+
+
+def test_version_reports_installed_distribution_version() -> None:
+    result = CliRunner().invoke(app, ["--version"])
+
+    assert result.exit_code == 0
+    assert result.stdout == f"oar {distribution_version('openshell-agent-runner')}\n"
+
+
+def test_version_handles_unavailable_distribution_metadata(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    def missing_distribution(_distribution_name: str) -> str:
+        raise PackageNotFoundError
+
+    monkeypatch.setattr(
+        "openshell_agent_runner.cli.distribution_version", missing_distribution
+    )
+
+    result = CliRunner().invoke(app, ["--version"])
+
+    assert result.exit_code == 0
+    assert result.stdout == "oar unknown\n"
 
 
 @pytest.mark.parametrize(