deps(runner): bump claude-agent-sdk 0.2.128, anthropic 0.120.0 (#1725)

## SDK Version Bump

- `claude-agent-sdk`: 0.2.124 -> 0.2.128
- `anthropic`: 0.117.0 -> 0.120.0

### TL;DR

- 1 behavior change(s) to review
- 6 new feature(s), 3 bug fix(es)

## Behavior Changes

| Change | Package | Version | Action |
|--------|---------|---------|--------|
| **Typed `model_usage` on ResultMessage** | `claude-agent-sdk` |
0.2.126 | Review |

<details><summary><strong>New Features</strong> (6)</summary>

| Feature | Package | Version | Claude | Gemini | Default | Action |
|---------|---------|---------|--------|--------|---------|--------|
| **`terminal_reason` on ResultMessage** | `claude-agent-sdk` | 0.2.126
| Yes | - | Available | Review |
| **add claude-opus-5 model** | `anthropic` | 0.120.0 | Yes | - |
Available | Review |
| **add tool addition/removal blocks and tool_change events** |
`anthropic` | 0.120.0 | - | - | Available | Review |
| **expand client-side fallback credit token types and add server-side
fallbacks...** | `anthropic` | 0.120.0 | - | - | Available | Review |
| **add new stop reason 'model_context_window_exceeded'** | `anthropic`
| 0.119.0 | - | - | Available | Review |
| **add support for Managed Agents model effort, initial session events,
and thre...** | `anthropic` | 0.118.0 | Yes | - | Available | Review |

</details>

<details><summary><strong>Bug Fixes</strong> (3)</summary>

- **Fixed premature stdin closure when background tasks are in flight**
(`claude-agent-sdk` 0.2.127): `query()` no longer closes stdin on the
first `result` frame when background tasks (e.g. `run_in_background:
true` su...
- **tools** (`anthropic` 0.119.0): handle binary files in agent toolset
read/edit (#283)
- **aws** (`anthropic` 0.117.1): handle credentials correctly when using
AnthropicAWS.copy()

</details>

<details><summary><strong>Bundled Claude CLI Versions</strong>
(4)</summary>

| SDK Version | CLI Version |
|-------------|-------------|
| 0.2.128 | 2.1.220 |
| 0.2.127 | 2.1.219 |
| 0.2.126 | 2.1.218 |
| 0.2.125 | 2.1.217 |

</details>

<details><summary>Internal changes: <code>claude-agent-sdk</code>
(4)</summary>

- Updated bundled Claude CLI to version 2.1.220 (0.2.128)
- Updated bundled Claude CLI to version 2.1.219 (0.2.127)
- Updated bundled Claude CLI to version 2.1.218 (0.2.126)
- Updated bundled Claude CLI to version 2.1.217 (0.2.125)

</details>

<details><summary>Internal changes: <code>anthropic</code> (1)</summary>

- codegen related update (0.117.1)

</details>

---
_Automated by `.github/workflows/sdk-version-bump.yml`_

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: github-actions[bot]

components/runners/ambient-runner/pyproject.toml

@@ -23,8 +23,8 @@ dependencies = [
 
 [project.optional-dependencies]
 claude = [
-  "anthropic[vertex]>=0.117.0",
-  "claude-agent-sdk>=0.2.124",
+  "anthropic[vertex]>=0.120.0",
+  "claude-agent-sdk>=0.2.128",
 ]
 observability = [
   "langfuse>=3.14.5",