fix: slash command slackbot to respond in private msg

[wenxi-onyx]

Description

• /onyxbot should respond in ephemeral message, but instead sends to channel

How Has This Been Tested?

locally

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 5, 2025 6:42pm

[greptile-apps]

Greptile Summary

This PR fixes the Slack bot's slash command behavior to send responses as ephemeral (private) messages by default. The change modifies the logic in handle_regular_answer.py that determines when Slack bot responses should be ephemeral.

The key change is in the send_as_ephemeral condition, which previously used AND logic requiring both channel configuration AND bot message status. Now it uses OR logic, meaning slash commands (/onyx) will always trigger ephemeral responses unless it's a direct message to the bot.

This aligns with standard Slack UX patterns where slash command responses are typically private to the invoking user rather than visible to the entire channel. The change preserves the exception for direct messages since DMs are already private by nature. The modification integrates with the existing Slack bot infrastructure that uses the SlackMessageInfo model to track message metadata including the is_bot_msg flag that identifies slash command usage.

Confidence score: 4/5

• This PR is safe to merge with minimal risk as it's a targeted UX improvement for slash commands
• Score reflects a simple logical change with clear intent and preserved existing behavior for edge cases
• No files require special attention as the change is isolated to a single conditional statement

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[cubic-dev-ai]

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