Add Helm HTTP repository support

[andrew]

Adds a Helm registry for HTTP chart repositories. It reads index.yaml, maps package, version, dependency, and maintainer metadata, resolves artifact URLs, and requires a configured repository URL because Helm has no default registry.

Registers Helm through the all package and updates the supported ecosystem documentation.

Closes #60

[Copilot]

Pull request overview

Adds Helm HTTP chart repository support by introducing a new helm registry that parses index.yaml, exposes package/version/dependency/maintainer metadata, and integrates the new ecosystem into the registry registry (all/), documentation, and tests. It also updates core registry construction to return a clear error when an ecosystem has no default URL and none is provided.

Changes:

• Added internal/helm registry implementation and comprehensive tests for parsing and URL resolution.
• Updated core registry creation to error when both provided and default URLs are empty (required for Helm).
• Registered helm via all/all.go and updated README + ecosystem tests.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
registries_test.go	Adds helm to supported ecosystems and verifies URL-required behavior via registries.New.
README.md	Updates supported ecosystem count and documents Helm as “URL required”.
internal/helm/helm.go	Implements Helm HTTP repository client: fetches/parses index.yaml, maps metadata, resolves artifact URLs, and builds URLs.
internal/helm/helm_test.go	Adds tests covering versions, statuses, digests, dependencies, maintainers, URL resolution, malformed inputs, and custom auth.
internal/core/registry.go	Enforces “no configured URL” error when both requested and default URLs are empty.
go.mod	Adds YAML parser dependency and promotes vers to a direct dependency.
go.sum	Adds checksums for the new YAML dependency.
all/all.go	Registers the Helm ecosystem via blank import of internal/helm.

Suppressed comments (1)

internal/helm/helm.go:324

• condition / tags are not top-level Helm chart metadata fields. Including them in Package.Metadata can mislead consumers and can cause YAML unmarshalling failures if an index uses these keys with a non-string type.

	if entry.Condition != "" {
		metadata["condition"] = entry.Condition
	}
	if entry.Tags != "" {
		metadata["tags"] = entry.Tags

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