oxios 0.1.0

Oxios Agent OS — Agent Operating System powered by oxi-sdk
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# Fix Tests Report — Oxios Kernel Module Tests

## Summary

Added **21 new unit tests** across 3 critical kernel modules. All tests pass.

## Task 1: Supervisor Tests (`supervisor.rs`)

Added `#[cfg(test)] mod tests` with a `MockProvider` (implements `oxi_ai::Provider`) to construct a real `BasicSupervisor` with a real `EventBus`.

| Test | What it verifies |
|------|------------------|
| `test_fork_creates_agent` | Fork with a seed, agent appears in list with correct name/status/seed_id |
| `test_exec_updates_status_to_running` | Fork then exec transitions Starting → Running |
| `test_kill_sets_stopped` | Fork → exec → kill transitions Running → Stopped |
| `test_kill_unknown_agent_returns_error` | Killing a non-existent UUID returns error with "not found" |
| `test_list_returns_all_agents` | Fork 3 agents, list returns all 3 with correct IDs |
| `test_exec_unknown_agent_returns_error` | Bonus: exec on unknown ID errors |
| `test_wait_unknown_agent_returns_error` | Bonus: wait on unknown ID errors |

**7 tests** for supervisor.

## Task 2: Config Tests (`config.rs`)

Added `#[cfg(test)] mod tests` at end of file.

| Test | What it verifies |
|------|------------------|
| `test_default_config_validates` | `OxiosConfig::default()` produces 0 validation errors |
| `test_exec_config_default_allowed_commands` | Empty `allowed_commands` allows any binary |
| `test_is_binary_allowed_with_allowlist` | Non-empty allowlist restricts to listed binaries |
| `test_expand_home` | `~/path` expands via `$HOME`, non-tilde passes through |
| `test_invalid_cron_expression` | Invalid cron expression produces validation error |
| `test_config_serialization_roundtrip` | Serialize to TOML and deserialize back preserves fields |
| `test_exec_timeout_validation` | default_timeout > max_timeout produces error |
| `test_zero_max_agents_error` | `max_agents = 0` produces validation error |

**8 tests** for config.

## Task 3: Error Tests (`error.rs`)

The `Timeout` and `RateLimited` variants **already existed** in the codebase with correct status mappings (503 and 429 respectively). Added tests for them:

| Test | What it verifies |
|------|------------------|
| `test_timeout_error_status` | `KernelError::Timeout` → display contains "timed out", HTTP 503 |
| `test_rate_limited_error_status` | `KernelError::RateLimited` → display contains "Rate limit exceeded", HTTP 429 |

**2 tests** for error (plus 4 pre-existing = 6 total in module).

## Build Verification

```
$ cargo check -p oxios-kernel    # ✓ Compiles cleanly
$ cargo test -p oxios-kernel --lib -- supervisor::tests config::tests error::tests
# 21 passed; 0 failed
```

## Files Modified

| File | Lines added |
|------|------------|
| `crates/oxios-kernel/src/supervisor.rs` | ~100 (test module) |
| `crates/oxios-kernel/src/config.rs` | ~95 (test module) |
| `crates/oxios-kernel/src/error.rs` | ~25 (2 new tests) |