Show numan-maintained fork identity in info/search

[tonythethompson]

Enhance numan info and numan search to surface fork identity and upstream attribution for numan-maintained forks as Phase C/P4 rolls out.

[linear-code]

NUM-97

[coderabbitai]

🔗 Related PRs

#82 - feat(manifest): add fork-identity fields for Phase C / P4 (no forks yet) [open]

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