fix(engine): retain completed pay-life amount

[matthewevans]

Fixes #6956.

Preserves the distinction between a completed zero-life cost and a cost with no life-payment component across cost-payment continuations.

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📥 Commits

Reviewing files that changed from the base of the PR and between d38f364 and 8163fa6.

📒 Files selected for processing (5)

• crates/engine/src/game/costs.rs
• crates/engine/src/game/effects/mod.rs
• crates/engine/src/game/effects/pay.rs
• crates/engine/src/game/engine.rs
• crates/engine/src/types/ability.rs

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[github-actions]

Generated for head 8163fa68ce98165404a134a58bf684b1e28d8da9.

Parse changes introduced by this PR

✓ No card-parse changes detected.