fix(confluence): handle undefined page title crash in slugifyTitle

[twogood]

Summary

Fixes a crash when pulling Confluence pages where the API returns a page with a missing (undefined) title:

undefined is not an object (evaluating 'title.toLowerCase')

This happened because slugifyTitle unconditionally called .toLowerCase() on its argument, but the Confluence API can return pages without a title field at runtime despite the TypeScript typing.

Changes

Commit 1 — failing test (packages/confluence/src/hierarchy.test.ts):

• Adds a test that passes undefined as the page title to computeFilePath, reproducing the crash

Commit 2 — fix (packages/confluence/src/atlcli-dir.ts):

• Changes slugifyTitle signature from title: string to title: string | undefined | null
• Returns "" early for falsy input so the existing || "page" fallback in computeFilePath handles it gracefully

[BjoernSchotte]

Thanks again, David! Clean fix — the widened type signature + early return is exactly the right approach for an API-boundary type mismatch like this. Squash-merged into main.