Upgrade slack-morphism to 2.19

[chandima]

Fixes #515.

Slack messages were failing to send intermittently — 132 failures in one day, all sizes. Bot token verified working via curl, so the issue was in the HTTP client layer.

Bumping slack-morphism from 2.17 to 2.19 resolves it. The upgrade pulls in tokio-tungstenite 0.29 and signal-hook 0.4, which likely fix the stale connection / WebSocket reset issues we were seeing.

Tested with multiple messages including a full worker pipeline (arxiv paper review → browser tools → 3.5KB result delivered via retrigger). Zero send failures, zero retries needed.

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (2)

• Cargo.lock is excluded by !**/*.lock, !**/*.lock
• Cargo.toml is excluded by !**/*.toml

CodeRabbit blocks several paths by default. You can override this behavior by explicitly including those paths in the path filters. For example, including **/dist/** will override the default block on the dist directory, by removing the pattern from both the lists.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 523b363e-36af-4de3-8c20-90872d2aa484

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}