fix(engine): settle liminal riot token replacements

[matthewevans]

Fixes the liminal TokenEntry replacement resume that can re-surface an already-answered Riot prompt when Shelob creates a Food copy. Adds production-path coverage for both Riot choices.

Validation note: the engine-implementer planning, review, implementation, checkpoint, and measurement steps ran. The canonical measurement ended CANNOT_ANSWER because the required isolated projection build dirtied its base worktree Cargo.lock; runtime completion verification and immutable implementation review did not run.

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📥 Commits

Reviewing files that changed from the base of the PR and between fb6bb00 and f77ed8e.

📒 Files selected for processing (2)

• crates/engine/src/game/engine_replacement.rs
• crates/engine/tests/integration/shelob_repro_token.rs

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[github-actions]

Generated for head f77ed8eaff07a4fa5f64e1add9098cfedc7c8699.

Parse changes introduced by this PR

✓ No card-parse changes detected.