refactor: move slack bot implementation

[RSO]

Summary

• move the Slack bot implementation into a platform adapter module
• keep the existing src/lib/slack-bot.ts entry point via re-exports
• set up the directory structure for future platform adapters

Testing

• pnpm typecheck

[kiloconnect]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Clean refactoring PR that moves the Slack bot adapter from src/lib/slack-bot.ts to src/lib/bots/platforms/slack/slack-bot-adapter.ts, replacing the original file with re-exports to maintain backward compatibility. The code is identical — no logic, security, or behavioral changes.

Files Reviewed (2 files)

• src/lib/bots/platforms/slack/slack-bot-adapter.ts — new file, 502 lines (moved from src/lib/slack-bot.ts)
• src/lib/slack-bot.ts — replaced with re-exports of KiloBotMessageResult and processKiloBotMessage