Exclude self-care package from wizard operations

[Copilot]

The setup wizard listed self-care as a selectable operation, but it's a repository-local package that runs live accessibility/Primer-brand checks against the central-agentic-ops catalog repository itself and isn't meant to be installed into a consumer's control plane.

Changes

• Added a filter in docs/lib/configured-operations.mjs's selectConfiguredOperations to exclude the self-care slug from the wizard's operations list, even though it remains configured in .github/central-agentic-ops.json's control-plane.packages for this repository's own control plane.
• Added unit test coverage in tests/unit/landing-page-diagram.test.mjs verifying the exclusion.

const WIZARD_EXCLUDED_SLUGS = new Set(["self-care"]);

export function selectConfiguredOperations(controlPolicy, catalogEntries) {
  // ...
  return Object.keys(configuredPackages)
    .filter((slug) => !WIZARD_EXCLUDED_SLUGS.has(slug))
    .map((slug) => { /* ... */ });
}