Add atomic CLI resource lookups

[noise64]

• resolves GOL-327
• adds exact natural-key registry lookups for accounts, plugins, agent secrets, retry policies, security schemes, and domain registrations
• switches CLI resource resolution from list-and-search to generated atomic client methods while keeping ID-based mutations
• resolves account-qualified application/environment references atomically and supports manifest-driven creation for explicit accounts while keeping explicit references lookup-only
• adds consistent --account <EMAIL> / --account-id <UUID> scope to account, card, and plugin commands
• supports plugin name/version and explicit --id identities, with documented conflicts and explicit-account list semantics
• removes retired component-plugin parser/handler scaffolding and updates ignored legacy tests with the retired-workflow reason
• rewrites current CLI plugin documentation and the plugin-management skill around registry commands and declarative manifests
• adds parser, SQLite/PostgreSQL repository, and generated-client integration coverage
• regenerates OpenAPI, REST API reference docs, and skill-derived how-to guides

[netlify]

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[github-actions]

📖 Docs preview: https://docs-hjazytxjv-golem-cloud.vercel.app

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