Document the published Stack CLI 0.5.0 workflow

[konojunya]

Summary

• Pin the published CLI 0.5.0 tag and regenerate four-language documentation and the agent skill.
• Document JSON automation, configuration diagnosis, and installer-owned updates.
• Preserve immutable machine resources unchanged.

Verification

• Shared-source generation checks and 17 tests pass.
• Machine resource validation and immutability checks pass.
• Published release tag and commit are verified; CI exercises the attested native archive.