Generate fully-qualified enum container docs

[deevus]

Parent

Parent PRD: #5

What to build

Make enum-qualified constants produce fully-qualified enum container documentation through the normal database, markdown, cache, and lookup path. A user should be able to look up a fully-qualified global enum such as @GlobalScope.JoyButton and see a coherent enum page listing its values, numeric values, and descriptions. Existing individual enum value entries must continue to exist and remain lookup-compatible.

Acceptance criteria

• Enum-qualified constants generate an explicit enum container entry in the documentation database.
• @GlobalScope.JoyButton-style lookups render an enum page with the enum's values.
• Enum value listings include names, numeric values, and descriptions when present.
• Existing individual enum value entries remain available after enum container generation.
• The enum container entry participates in normal markdown cache generation and readback.
• Behavior-focused tests cover database generation, markdown output, cache generation/readback, and enum value compatibility.

Blocked by

None - can start immediately