GitHub repository cache identity is case-sensitive

Description

GitHub repository owner and name casing is preserved in cache identities and cache paths. References such as GitHub.com/Owner/Repo and github.com/owner/repo resolve to the same GitHub repository, but OpenCode treats them as different repositories and allocates different checkout directories. GitHub identity keys should normalize owner/repository casing while labels and requested remote URLs retain their original spelling.

Plugins

None

OpenCode version

1.18.30

Steps to reproduce

1. Parse GitHub.com/Owner/Repo and github.com/owner/repo as repository references.
2. Compare them with the repository identity helper.
3. Generate a cache path for each reference using the same cache root.

Expected: the references compare equal and use the same cache path.

Actual: they compare unequal and produce casing-dependent cache paths.

Screenshot and/or share link

Not applicable; the helper calls above reproduce the identity mismatch directly.

Operating System

All

Terminal

All