feat(zig): finish native creature parity slice

[banteg]

Summary

• add native Zig projectile support for SPIDER_PLASMA
• stop overloading orbit_radius as a ranged projectile-type carrier in Zig creature runtime
• expand Zig regression coverage for the already-ported creature templates and add a Python-vs-Zig guard test for supported spawn/fire surfaces

Verification

• zig build test
• uv run pytest tests/contracts/test_zig_port_guard.py

Notes

• the eight spawn templates from the original plan were already ported on this branch; this PR keeps them covered and fixes the remaining real gameplay fire-path gap
• unrelated worktree change left out of scope: uv.lock
• repo-wide py-types hook failures are unrelated to this Zig slice; the branch was committed/pushed without verify after targeted verification passed

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