[Bug] kb_capture_web may duplicate the 'web' tag

[dxu104]

Summary

When using kb_capture_web, the saved note may contain a duplicated web tag.

What I observed

In my test, Claude called kb_capture_web with tags that already included web. The resulting note ended up with web twice.

Likely cause

captureWeb() appends web automatically via tagList.push('web'), but the caller may already provide web in the input tags.

Suggested fix

Deduplicate tags before writing frontmatter.

For example, normalize and de-duplicate the final tag list before generating:

• tags: [...]

Why it matters

This is a small issue, but it creates noisy metadata in Obsidian and makes the captured note look less clean.