fix(slack): use channel= kwarg for files_upload_v2 (closes #102)

[patrick-chinchill]

Summary

Fixes #102. SlackAdapter._upload_files was passing channel_id= to slack-sdk's files_upload_v2. The documented kwarg is channel=; passing channel_id= collides with the kwarg slack-sdk adds internally when it forwards to files_completeUploadExternal, raising a hard TypeError on every Slack file upload.

One-line fix in src/chat_sdk/adapters/slack/adapter.py:

- kwargs: dict[str, Any] = {"channel_id": channel, "file_uploads": file_uploads}
+ kwargs: dict[str, Any] = {"channel": channel, "file_uploads": file_uploads}

Adds a regression test (test_file_upload_uses_channel_kwarg_not_channel_id) that asserts the upload call carries channel= and not channel_id=, pinning the kwarg name against future drift.

Test plan

• uv run pytest tests/test_slack_api.py -q — 73 passed
• uv run ruff check && uv run ruff format --check — clean
• Full uv run pytest tests/ — only preexisting unrelated test_github_webhook failure remains

https://claude.ai/code/session_01WArZSuq5JFJwM9ecwqthhX

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between be0852e and 7ab59a9.

📒 Files selected for processing (2)

• src/chat_sdk/adapters/slack/adapter.py
• tests/test_slack_api.py

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[gemini-code-assist]

Code Review

This pull request fixes a bug in the Slack adapter where file uploads would fail due to a keyword argument collision. Specifically, the keyword argument passed to the Slack SDK's files_upload_v2 was corrected from channel_id to channel. Additionally, a regression test has been added to verify this behavior and prevent future occurrences. I have no further feedback to provide as the changes are correct and well-tested.