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Add comparison and logical/bitwise operators

Implements =, >, < (comparison, returning 1/0) and xor, xnor, and (&
synonym), nand, or, nor (bitwise, on i64-truncated operands), plus
not(x), shl(x, y), shr(x, y).

New precedence chain: comparison (loosest) > logical-or-family >
logical-and-family > existing arithmetic chain.

Deviates from the original: = now tests equality instead of assigning
a variable (there is no assignment operator in this port), and ? (the
original's equality test) was dropped since it is no longer needed.

Bitwise ops use standard two's-complement wraparound semantics
(matching Rust's native i64 bitwise operators) rather than raising an
overflow error, including shl.

Updates docs/functions/logic.md (v1, fixes two contradictory example
typos in the original doc draft), DESIGN.md scope/catalog/grammar,
README examples, and CHANGELOG.md.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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