chore: release v0.2.16

[github-actions]

🤖 New release

• libm: 0.2.15 -> 0.2.16 (✓ API compatible changes)

Changelog

0.2.16 - 2025-06-15

Other

• Clean up and sort manifest keys
• Fix incorrect result and add tests
• Fix unintentional skips in binop_common
• Use x.biteq(y) rather than x.to_bits() == y.to_bits()
• Fix new dead_code warnings from recent nightlies
• Reuse libm's Caat and CastFrom in compiler-builtins
• Reuse MinInt and Int from libm in compiler-builtins
• Add a note saying why we use frintx rather than frintn
• Typo in README.md
• Update CmpResult to use a pointer-sized return type
• Clean up unused files
• Fix i256::MAX

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