Fix Orvar copying itself instead of targeted permanent (fixes #4830)

[kiannidev]

Summary

• Resolve ParentTarget on spell-cast triggers from the triggering spell's committed object targets.
• Fixes Orvar creating a copy of itself when the cast spell targeted another permanent you control (e.g. a land).

Test plan

• cargo test -p engine --test integration orvar
• New integration test: land-targeting instant creates a token copy of the land, not Orvar

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[gemini-code-assist]

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[matthewevans]

Thanks for trying the narrower Orvar fix. I’m requesting changes on the current head.

1. The new regression test does not discriminate the bug it claims to cover. orvar_copies_targeted_land_not_itself only asserts that permanent count increased and the original Orvar object still exists. That would still pass if the trigger created a token copy of Orvar instead of the targeted land. Please assert the copied object identity directly, e.g. that there are two Forest/target-land copies or one additional land-copy token, and not a second Orvar.

2. The Rust lint workflow is failing. The diff also adds a function-local use crate::types::events::GameEvent; in targeting.rs; imports need to live at module scope in this repo.

[matthewevans]

Reviewed the updated head after the requested changes. The Orvar fix now binds ParentTarget from the triggering spell’s committed object targets, and the regression discriminates the bug by proving no Orvar token is created while exactly one land token copy is created. I also resolved the current main.rs integration-test mod-line conflict and verified formatting/parser-gate during the merge-forward commit; CI can finish under merge-when-ready.