fix(copilot): pin claude-agent-sdk to 0.1.45 to fix tool_reference content block validation error (#12294)

Requested by @majdyz

## Problem

CoPilot throws `400 Invalid Anthropic Messages API request` errors on
first message, both locally and on Dev.

## Root Cause

The CLI's built-in `ToolSearch` tool returns `tool_reference` content
blocks (`{"type": "tool_reference", "tool_name":
"mcp__copilot__find_block"}`). When the CLI constructs the next
Anthropic API request, it passes these blocks as-is in the
`tool_result.content` field. However, the Anthropic Messages API only
accepts `text` and `image` content block types in tool results.

This causes a Zod validation error:
```
messages[3].content[0].content: Invalid input: expected string, received array
```

The error only manifests when using **OpenRouter** (`ANTHROPIC_BASE_URL`
set) because the Anthropic TypeScript SDK performs stricter client-side
Zod validation in that code path vs the subscription auth path.

PR #12288 bumped `claude-agent-sdk` from `0.1.39` to `^0.1.46`, which
upgraded the bundled Claude CLI from `v2.1.49` to `v2.1.69` where this
issue was introduced.

## Fix

Pin to `0.1.45` which has a CLI version that doesn't produce
`tool_reference` content blocks in tool results.

## Testing
- CoPilot first message should work without 400 errors via OpenRouter
- SDK compat tests should still pass

autogpt_platform/backend/poetry.lock

@@ -899,17 +899,17 @@ files = [
 
 [[package]]
 name = "claude-agent-sdk"
-version = "0.1.46"
+version = "0.1.45"
 description = "Python SDK for Claude Code"
 optional = false
 python-versions = ">=3.10"
 groups = ["main"]
 files = [
-    {file = "claude_agent_sdk-0.1.46-py3-none-macosx_11_0_arm64.whl", hash = "sha256:66aed2199234d751a0f8c605ba34d1b3d93e94b4e939526ee04ca243ba74cf62"},
-    {file = "claude_agent_sdk-0.1.46-py3-none-manylinux_2_17_aarch64.whl", hash = "sha256:440f0923811f9e1c6c992655beadb527eb2ed4024059880018fd6ec92846d429"},
-    {file = "claude_agent_sdk-0.1.46-py3-none-manylinux_2_17_x86_64.whl", hash = "sha256:460ab0ad549331dc35ef1bc212a7cd8e8b4d2876b10df7bfa9f4000c95b94c15"},
-    {file = "claude_agent_sdk-0.1.46-py3-none-win_amd64.whl", hash = "sha256:4d0d5b14ad04d6e8fbe5b1ffe3e48d0da38d2602e9efc4f21f0e4593987cf67a"},
-    {file = "claude_agent_sdk-0.1.46.tar.gz", hash = "sha256:7c2b6f3062ca6f016dacb8660660b4afe80935f4eabe0db677649edaddeef2ec"},
+    {file = "claude_agent_sdk-0.1.45-py3-none-macosx_11_0_arm64.whl", hash = "sha256:26a5cc60c3a394f5b814f6b2f67650819cbcd38c405bbdc11582b3e097b3a770"},
+    {file = "claude_agent_sdk-0.1.45-py3-none-manylinux_2_17_aarch64.whl", hash = "sha256:decc741b53e0b2c10a64fd84c15acca1102077d9f99941c54905172cd95160c9"},
+    {file = "claude_agent_sdk-0.1.45-py3-none-manylinux_2_17_x86_64.whl", hash = "sha256:7d48dcf4178c704e4ccbf3f1f4ebf20b3de3f03d0592086c1f3abd16b8ca441e"},
+    {file = "claude_agent_sdk-0.1.45-py3-none-win_amd64.whl", hash = "sha256:d1cf34995109c513d8daabcae7208edc260b553b53462a9ac06a7c40e240a288"},
+    {file = "claude_agent_sdk-0.1.45.tar.gz", hash = "sha256:97c1e981431b5af1e08c34731906ab8d4a58fe0774a04df0ea9587dcabc85151"},
 ]
 
 [package.dependencies]
@@ -8840,4 +8840,4 @@ cffi = ["cffi (>=1.17,<2.0) ; platform_python_implementation != \"PyPy\" and pyt
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<3.14"
-content-hash = "362a52f55e70ec71ec34bade8dbda160d78ddc28d127cd51d9ac1034115cc862"
+content-hash = "7189c9725ca42dfe6672632fe801c61248d87d3dd1259747b0ed9579b19fe088"

autogpt_platform/backend/pyproject.toml

@@ -16,7 +16,7 @@ anthropic = "^0.79.0"
 apscheduler = "^3.11.1"
 autogpt-libs = { path = "../autogpt_libs", develop = true }
 bleach = { extras = ["css"], version = "^6.2.0" }
-claude-agent-sdk = "^0.1.46"  # see copilot/sdk/sdk_compat_test.py for capability checks
+claude-agent-sdk = "0.1.45"  # see copilot/sdk/sdk_compat_test.py for capability checks
 click = "^8.2.0"
 cryptography = "^46.0"
 discord-py = "^2.5.2"