fix: keep nested operators out of formula matches

[akcorca]

Summary

• require every regex-captured operand to have independently balanced delimiters
• prevent nested set operators inside probability/function syntax from becoming whole-formula meanings
• rebuild the release WASM on the remote x86_64 Linux build host

Verification

• bun run check
• 63 Rust tests and 26 Bun tests
• 236 v0.11 safety queries, native/WASM parity, calibration, budgets, and package smoke
• regression coverage for Pr(A cap B), the conditional-probability identity, and nested union

Found during CorTeX staging dogfood for corca-ai/cortex#405.

Refs #85
Refs #91

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