stacklok / toolhive / 23187776639

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Add Skills API client for registry extension (#4173)

The toolhive-registry-server exposes a Skills API as a ToolHive-specific
extension under /v0.1/x/dev.toolhive/skills. This adds an HTTP client
to query that API, following the same patterns as the existing server
client.

- Extract shared HTTP client builder and error types into shared.go
  so both the server client and new skills client reuse the same
  security controls (private IP policy, auth token injection, error
  handling with LimitReader)
- Add SkillsClient interface with GetSkill, GetSkillVersion,
  ListSkills, SearchSkills, and ListSkillVersions methods
- Add RegistryHTTPError with Unwrap() for structured 401/403 handling
- Migrate existing server client to use the shared error type
- Add comprehensive table-driven tests with httptest

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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