Channel Digest

Given the comma-separated channel names provided in $ARGUMENTS (strip leading # and whitespace from each):

1. Parse the argument into individual channel names. Strip leading # and whitespace from each name.

2. For each channel: a. Use slack_search_channels to find the channel ID. b. Use slack_read_channel to read recent messages (use a limit of 50 messages per channel to keep things manageable). c. Summarize the key activity in that channel: main topics, decisions, questions, and notable messages.

3. Present the digest in this format:

   *Channel Digest — <today's date>*
   
   *#channel-1*
   - Summary point 1
   - Summary point 2
   
   *#channel-2*
   - Summary point 1
   - Summary point 2
   
   ...
   

4. For each channel, keep the summary to 3-5 bullet points maximum. Focus on what's actionable or noteworthy.

5. If a channel has no recent activity, note that it's been quiet and mention when the last message was posted (if visible).

6. If a channel name can't be found, let the user know and continue with the remaining channels.