[Bug]: Slack bridge fails on Windows with 'Directory must stay within workspace root' due to long path prefix

[Lumi-AI-Colleague]

Summary

When using the Slack integration on Windows, the bot frequently responds with the error:
Directory must stay within workspace root: //?/c:/users/...

Root Cause

In apps/opencode-router/src/bridge.ts, the isWithinWorkspaceRoot function uses path.relative(workspaceRoot, resolved).
On Windows, workspaceRoot can sometimes include the long path prefix (e.g., //?/c:/), while resolved resolves to a standard absolute path (e.g., c:\...).
Node.js path.relative treats these as different roots and returns an absolute path. The check if (isAbsolute(relativePath)) return false; then incorrectly fails the validation, blocking legitimate directory access.

Steps to reproduce

1. Run Openwork on Windows.
2. Connect a Slack bot via opencode-router.
3. Attempt to interact with the bot in Slack.
4. The bot replies with the directory boundary error.

Suggested Fix

Normalize the workspaceRoot to strip the //?/ prefix before performing path comparisons, or use a more robust path normalization strategy for Windows paths in isWithinWorkspaceRoot.