Add the github add-on: manifest with a credential slot, a read-only
tool set (code search, files, trees, issues, pull requests and diffs)
with size caps and untrusted-content framing, rate-limit mapping, a
connector route that checks the token, and a fake GitHub API for tests.
Assisted-by: Claude:claude-sonnet-5-5 [go]
Add a manifest credentials declaration, host-enforced per-binding
resource lists, Request.Credential and ResourceKey set by the host, and
a typed ErrRateLimited that reaches the model as rate_limited.
Assisted-by: Claude:claude-sonnet-5-5 [go]