feat: add Attachment support with colored sidebars#38
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Adds Attachment struct with color, blocks, and fallback fields. Adds attachments field to Message with push_item builder support. Enables colored sidebar rendering in Slack webhook messages.
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Thanks for the PR — great work! The comment link (https://api.slack.com/reference/messaging/attachments) appears to be broken. Would it be OK to replace it with https://docs.slack.dev/legacy/legacy-messaging/legacy-secondary-message-attachments/? If you prefer, I can make the change and update the PR. Thanks again. |
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Summary
Attachmentstruct withcolor,blocks, andfallbackfieldsattachmentsfield toMessagewithpush_itembuilder support andmax_item_20validationmax_item_50to match Slack's per-attachment block limitBuilderderive,serdeskip,validatorsThis enables colored sidebar rendering in Slack webhook messages — the only mechanism Slack provides for message-level color accents.