feat(sql-runtime): add neq comparison operator support

[jkomyno]

This PR:

• adds support for neq, the negation of the comparison comparison operator eq
• closes TML-1693

Summary by CodeRabbit

• New Features

  • Added support for a not-equal (neq) comparison operator across the SQL query builder and adapters, enabling != style filtering.

• Tests

  • Added tests validating neq behavior and error handling alongside existing comparison operator coverage.

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[coderabbitai]

Walkthrough

Adds a new "not equal" (neq) comparison operator across the SQL query builder: AST/types, public types, column builder API, operations registry, tests, and Postgres adapter mapping to !=.

Changes

Cohort / File(s)	Summary
AST & Type definitions packages/sql/lanes/relational-core/src/ast/types.ts, packages/sql/lanes/relational-core/src/types.ts	Added neq to BinaryOp and added neq(value: ParamPlaceholder) to column-builder public types/interfaces.
Column builder implementation packages/sql/lanes/relational-core/src/schema.ts	Added neq(value) instance method on ColumnBuilderImpl returning a BinaryBuilder using the neq operator.
Operations registry packages/sql/lanes/relational-core/src/operations-registry.ts	Exposed neq comparison method on the base result object returned by executeOperation (neq: createComparisonMethod('neq')).
Postgres adapter packages/targets/postgres-adapter/src/core/adapter.ts	Mapped neq to SQL != in the binary expression renderer's operator map.
Tests packages/sql/lanes/relational-core/test/schema.test.ts, packages/sql/lanes/sql-lane/test/sql-comparison-operators.test.ts	Added neq to operator arrays and parameterized tests; added tests verifying column.neq() error handling matches other operators.

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• packages/sql/lanes/sql-lane/test/sql-comparison-operators.test.ts (2 hunks)

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[wmadden]

Good job @jkomyno 👍🏻

One small suggestion

[wmadden]

Why is that cast necessary? It might be simpler to write as

        // @ts-expect-error testing invalid input
        id.neq({ kind: 'invalid' });

our agents are consistently making this mistake

[jkomyno]

Fixed 4014e2d