* feat(installer): use GitHub API as primary fetch with raw CDN fallback
Corporate proxies commonly block raw.githubusercontent.com while allowing
api.github.com. Add fetchGitHubFile() to RegistryClient that tries the
GitHub Contents API first, falling back to the raw CDN transparently.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix(installer): cap redirect depth and preserve dual-fallback errors
Add maxRedirects parameter to fetch() and _fetchWithHeaders() to prevent
unbounded redirect recursion. Wrap CDN fallback in try/catch and throw
AggregateError with both API and CDN errors for better diagnostics.
Extract marketplace repo coordinates into named constants in
external-manager.
* chore(installer): drop unused fetchJson and fetchGitHubJson
Neither method has any callers. Also drop the corresponding test.
* refactor(test): fold registry tests into test-installation-components
No reason for RegistryClient tests to be a separate runner — the same
file already tests the registry consumers in Suite 33. Drop test:registry
from package.json scripts and quality gate.
* fix(installer): include URL, API message, and rate-limit info in HTTP errors
Non-2xx responses previously yielded bare `HTTP 403`. Now surface the
request URL, GitHub's JSON error message (or body snippet), X-RateLimit-Reset
when quota is exhausted, and Retry-After. Turns a mystery 403 into
'rate limit exhausted; resets at 2026-04-15T18:00:00Z' — the difference
between 'try GITHUB_TOKEN' and a wild goose chase.
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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