feat(query-spec): shared query language spec package; wire codegen + query-builder

[pyramation]

Summary

New zero-dependency leaf package packages/query-spec (unscoped npm name query-spec) defining the Constructive query language grammar — the single source of truth for filter, ordering, and pagination shapes shared by the GraphQL SDK/ORM layer and the SQL query builder.

query-spec exports:

• Operator groups as const arrays + derived unions: NULL/COMPARISON/DISTINCT/LIST/LIKE/PATTERN/INSENSITIVE/ARRAY/POSTGIS_FILTER_OPERATORS, FILTER_OPERATORS, LOGICAL_OPERATORS, with runtime guards isFilterOperator() / isLogicalOperator().
• Generic grammar: FieldFilter<TOperand>, RelationalFilter<TOperand> (every/some/none), Filter<TOperand> — generic over the operand type so each layer constrains what fields compare against (JSON values in the SDK; values/exprs/subqueries in SQL).
• OrderByItem/OrderDirection, PageInfo, ConnectionResult<T>.

Wiring (no breaking changes):

• graphql/codegen src/types/query.ts: the previously inlined FilterOperator/FieldFilter/RelationalFilter/Filter/OrderByItem/PageInfo/ConnectionResult definitions are deleted and re-exported from query-spec, so all existing @constructive-io/graphql-codegen type consumers are unaffected.
• postgres/query-builder: FieldFilter is now composed from the spec's operator-group unions via mapped types, preserving its per-group operand precision:

  export type FieldFilter =
    { isNull?: boolean } &
    { [K in ComparisonFilterOperator]?: Operand | QueryBuilder } &
    { [K in DistinctFilterOperator]?: Operand } &
    { [K in ListFilterOperator]?: Operand[] | QueryBuilder } &
    { [K in LikeFilterOperator]?: Operand } &
    { [K in PatternFilterOperator]?: string };

  so operator names can never drift from the SDK grammar (type-only import; adds only the tiny query-spec dep).

One subtlety: Filter is an interface (not an intersection type) because TS's excess-property check mishandles recursive generic intersections of an index signature + named combinators (not: { field: ... } failed to compile as an intersection).

Tests: new query-spec suite; query-builder 111 passing; codegen 358 passing.

Link to Devin session: https://app.devin.ai/sessions/3766c470681e402680eae001e9679801
Requested by: @pyramation

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