[christophersesugh]

Summary

Complete the MemoFS manifesto relocation to 0xBUFF's parent application, keeping the documentation site focused on technical material.

Canonical home: https://0xbuff.com/products/memofs/manifesto — implemented in platform#106.

Changes

• Update the documentation footer's MemoFS Manifesto link to the canonical company URL, using the existing external-link handling.
• Keep the legacy https://docs.0xbuff.com/manifesto route as an HTTP 301 redirect to that URL, preserving inbound links.
• Remove the old standalone manifesto Markdown, Fumadocs collection wiring, static prerender registration, and obsolete content-dir setting.
• Remove the superseded docs-host manifesto entry from the sitemap; leave the canonical page to be indexed on the company site.
• No changes to tool documentation, catalog/R2 publication, dependencies, or runtime package behavior.

Verification

• Reviewed route resolution, source collection wiring, sitemap, footer, and removal scope.
• Branch comparison should show only docs migration/removal files.
• Documentation CI passed on this branch (workflow run 43279406567). The HTTP 301 behavior still needs browser verification after staging release; no deployment is claimed.

Deployment sequence

1. Merge and release platform#106 to make the canonical destination live.
2. Merge and release this PR to enable the docs-host redirect and footer pointer.
3. Close the superseded editorial-only documentation#13 without merging.

This retains the old public URL as a permanent redirect; both repositories continue to require explicit release/deployment approval.