feat(slack): session link auto-post + aside filter (merge PR #1 with CI fix)

[jld-adriano]

Summary

Merges the two features from PR #1 (feat/slack-session-link-auto-post) into main, on top of PR #2's GitHub-hosted runner CI fix. The merge resolved CI workflow conflicts by keeping PR #2's runner configuration.

Two changes (29 lines added across 2 files):

1. Session link auto-post (src/slack/monitor/message-handler/dispatch.ts): When a new thread session starts (IsFirstThreadTurn && message.thread_ts), posts a 🔗 Session link to the thread using OPENCLAW_PUBLIC_URL. Fire-and-forget (.catch swallows errors). No-op if OPENCLAW_PUBLIC_URL is unset.

2. "aside" prefix filter (src/slack/monitor/message-handler.ts): Messages starting with aside (case-insensitive, after stripping Slack @mentions) are silently dropped before debouncing/dispatch. Lets users have side conversations in threads without triggering the bot.

Review & Testing Checklist for Human

• Verify aside filter insertion point: The filter is added after trackEvent?.() and before threadTsResolver.resolve() in the message handler's return function (~line 119). Confirm this is early enough to prevent any processing (debounce, dispatch, etc.) for aside messages.
• Verify dispatch.ts session link logic: The IsFirstThreadTurn check and chat.postMessage call are inserted after identity resolution and before direct-message handling. Confirm prepared.ctxPayload.IsFirstThreadTurn is reliably set by the prepare step for new thread sessions.
• Verify CI workflow files are intact: The merge resolved conflicts in 5 .github/workflows/*.yml files by taking main's version (GitHub-hosted runners from PR ci: switch from Blacksmith to GitHub-hosted runners #2). Confirm no PR ci: switch from Blacksmith to GitHub-hosted runners #2 changes were lost.
• Test plan: Deploy via monorepo submodule update → (1) send aside hello in a bot thread → bot should not respond; (2) send @Bot aside hello → bot should not respond; (3) start a new thread → bot should post a 🔗 Session link before its reply; (4) verify OPENCLAW_PUBLIC_URL is set in the pod env.

Notes

• The \b word boundary in /^aside\b/i prevents false matches on words like "asides" or "asidebar".
• The companion monorepo PR (exa-labs/monorepo#27113) that adds OPENCLAW_PUBLIC_URL to deploy.ts is already merged.
• This PR was NOT tested end-to-end yet — the original PR feat(slack): auto-post session link + skip 'aside' messages #1 had stale CI (Blacksmith runners) that never completed. E2E testing will happen after this merges and the monorepo submodule is updated.

Link to Devin session: https://app.devin.ai/sessions/460eec68d4c74aaa8c85af43c562f11f
Requested by: @jld-adriano

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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