docs: apply fork notice and credit to README_CRATES

[UnbreakableMJ]

Applies the same fork/credit treatment to README_CRATES.md (the readme = target in Cargo.toml) that PR #4 made to README.md:

• Fork notice + Credits section crediting cpx by Bhuminjay Soni (@11happy); original copyright in the License section.
• Drop the crates.io badge and cargo install (not published); fix the broken LICENSE-MIT link.
• Document the v0.1.4 prebuilt binaries; fix the Rust prerequisite to 1.85 (edition 2024).

🤖 Generated with Claude Code

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Configuration used: defaults

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Run ID: e089e7dd-3b48-4061-b9e0-88979ec25ab4

📥 Commits

Reviewing files that changed from the base of the PR and between ec77a07 and e72dc33.

📒 Files selected for processing (1)

• README_CRATES.md

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• Commit unit tests in branch readme-crates-fork-notice

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