Drop the library-logic tests that now run in rain.math.float

[thedavidmeister]

The library-logic tests this crate kept over the pinned rain-math-float package now run in rain.math.float over its own source (rainlanguage/rain.math.float#275). This crate keeps the tests of its Rust API: Default, serde, hex round-trip and error rendering.

Stacked on #21.

QA

• Discriminating tests: cargo test 10 passed + 36 doctests; clippy clean with and without test-harness.
• Mutations applied: none here, this is a deletion; the removed tests were mutation-probed where they now live (Run the bindings' library tests here, over this source rain.math.float#275: a broken add fails 10, a reverting constructor fails 73).
• Oracle: the library's crates/tests suite.
• Category check: removes only what moved; every test of the bindings' own behaviour stays.

🤖 Generated with Claude Code

https://claude.ai/code/session_01QyCCzi9WZPhuXcU1hwr2bq

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