deps(runner): bump claude-agent-sdk 0.2.115 (#1711)

## SDK Version Bump

- `claude-agent-sdk`: 0.2.110 -> 0.2.115

### TL;DR

- 1 behavior change(s) to review
- 0 new feature(s), 4 bug fix(es)

## Behavior Changes

| Change | Package | Version | Action |
|--------|---------|---------|--------|
| **Fixed e2e stderr test flakiness by running the query from a clean
working dir...** | `claude-agent-sdk` | 0.2.111 | Review |

<details><summary><strong>Bug Fixes</strong> (4)</summary>

- **Zombie CLI subprocess prevention** (`claude-agent-sdk` 0.2.111):
Shielded subprocess cleanup from asyncio cancellation so
`SIGTERM`/`SIGKILL` teardown always runs, preventing orphane...
- **Silent whitespace loss on large NDJSON lines** (`claude-agent-sdk`
0.2.111): Fixed the NDJSON parser silently dropping whitespace when a
single line exceeded the 64 KiB stream buffer, which coul...
- **TypeError on non-dict message content** (`claude-agent-sdk`
0.2.111): Fixed an uncaught `TypeError` when the CLI emits a message
whose `content` field is a plain string or other non-dict...
- **`can_use_tool` shadowed by `allowed_tools`** (`claude-agent-sdk`
0.2.111): Added a runtime warning when a `can_use_tool` callback is
registered alongside `allowed_tools` or `bypassPermissions`...

</details>

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

| SDK Version | CLI Version |
|-------------|-------------|
| 0.2.115 | 2.1.206 |
| 0.2.114 | 2.1.205 |
| 0.2.113 | 2.1.204 |
| 0.2.112 | 2.1.203 |
| 0.2.111 | 2.1.202 |

</details>

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

- Updated bundled Claude CLI to version 2.1.206 (0.2.115)
- Updated bundled Claude CLI to version 2.1.205 (0.2.114)
- Updated bundled Claude CLI to version 2.1.204 (0.2.113)
- Updated bundled Claude CLI to version 2.1.203 (0.2.112)
- Updated bundled Claude CLI to version 2.1.202 (0.2.111)

</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

@@ -24,7 +24,7 @@ dependencies = [
 [project.optional-dependencies]
 claude = [
   "anthropic[vertex]>=0.116.0",
-  "claude-agent-sdk>=0.2.110",
+  "claude-agent-sdk>=0.2.115",
 ]
 observability = [
   "langfuse>=3.14.5",