On GitHub Actions runners, `unshare` binary exists at /usr/bin/unshare
but user namespaces (CLONE_NEWUSER) are restricted, causing `unshare
--user --map-root-user` to silently fail. This produced empty stdout
in the bash_stdout_roundtrip parity test (mock_parity_harness.rs:533).
Replace the simple `command_exists("unshare")` check with
`unshare_user_namespace_works()` that actually probes whether
`unshare --user --map-root-user true` succeeds. Result is cached
via OnceLock so the probe runs at most once per process.
Fixes: CI red on main@85c5b0e (Rust CI run 23933274144)
Catalog all 40 tools as real-impl vs stub, with specific behavioral
gap notes per tool. Identify missing bash submodules (18 upstream
vs 1 Rust), file validation gaps, MCP/plugin flow gaps, and runtime
behavioral gaps.
This replaces surface-count bragging with actionable gap tracking.
Port 7 missing tool definitions from upstream parity audit:
- AskUserQuestionTool: ask user a question with optional choices
- TaskCreate: create background sub-agent task
- TaskGet: get task status by ID
- TaskList: list all background tasks
- TaskStop: stop a running task
- TaskUpdate: send message to a running task
- TaskOutput: retrieve task output
All tools have full ToolSpec schemas registered in mvp_tool_specs()
and stub execute functions wired into execute_tool(). Stubs return
structured JSON responses; real sub-agent runtime integration is the
next step.
Closes parity gap: 21 -> 28 tools (upstream has 40).
fmt/clippy/tests all green.
Remove the #[ignore] gate from startup_banner_mentions_workflow_completions
by injecting a dummy ANTHROPIC_API_KEY. The test exercises LiveCli banner
rendering, not API calls. Cleanup env var after test.
Test suite now 102/102 in CLI crate (was 101 + 1 ignored).
Inject a dummy ANTHROPIC_API_KEY for
build_runtime_runs_plugin_lifecycle_init_and_shutdown so the test
exercises plugin init/shutdown without requiring real credentials.
The API client is constructed but never used for streaming.
Clean up the env var after the test to avoid polluting parallel tests.
Jobdori