[F2.4] Validate clean-install artifacts and entrypoints

[metaphorics]

Question

Implement clean-install package contract across five artifact targets and all public entry points without exclusions, compatibility shims, or copied reference code.

Blocked by

• Close performance and formal correspondence

Spine anchor

Ive — this leaf serves one bounded product obligation and one evidence ledger.

Acceptance

.outline/gates/F2.4.md reports every gate checked with current, non-pending evidence.