[P2] Extend conditional activation beyond extras

[spazyCZ]

Objective

Define whether UAAPS should support broader conditional activation beyond current extras-based feature bundles.

Priority

P2 — Nice to Have

Details

The spec now supports extras, but still lacks environment-based activation, capability-driven activation, user preference toggles, and generalized feature flags.

Acceptance Criteria

• Clarify whether broader conditional activation is in scope
• Define how it relates to extras and engines if adopted
• Update manifest and activation semantics if needed

Notes

Source: work/spec-gap-analysis.md