fix(types): export ParamEntry and ParamsIn - #31

🟢 Confidence 10/10 · safe to merge
Type-only re-exports; OptionalParamEntry/OptionalParams are public at src/core.ts:102 and reach both dialect entries through export * from "./core".
_{quality 100/100 · no findings · tests covered · risk low}

Exports ParamEntry, OptionalParamEntry, OptionalParams, ParamsIn and ParamsSatisfied from core, so declaration emit for exported param queries and defineFn helpers can name them. Safe to merge.

• core.ts re-exports the five param types; dialect entries pick them up via export * from "./core"
• test:package now compiles a declaration-emitting consumer covering when, whenTrue, union-named params, joins, CTEs, subqueries, unions

Fixed since the last review

• ✅ F1 · when queries still fail declaration emit: OptionalParamEntry unexported

_{56a2893 · Updated on every push. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}