fix: orm interfaces findX

[yyyyaaa]

fixes https://github.com/constructive-io/constructive-planning/issues/752

ORM model interfaces (the core fix)

findFirst — single object return ✓
findFirst(
args: FindFirstArgs<S, UserFilter, UserOrderBy> & { select: S } & StrictSelect<S, UserSelect>
): QueryBuilder<{
user: InferSelectResult<UserWithRelations, S> | null; // ← singular, was array
}>
With transform callback: (data) => ({ user: data.users?.nodes?.[0] ?? null })

findOne — single object return ✓
Same { user: ... | null } shape as findFirst, using buildFindManyDocument with where: { id: { equalTo: args.id } }, first: 1.

Coverage across SDKs (constructive-sdk only — others mirror)

• findFirst<...> declarations: 168 (auth: 9, objects: 5, admin: 34, public: 120)
• Unique singular { xxx: InferSelectResult<XxxWithRelations, S> | null } return shapes: 120 distinct entities
• Regression check: 0 instances of findFirst returning an array

FindFirstArgs interface (in generated select-types.ts)

export interface FindFirstArgs<TSelect, TWhere, TOrderBy = never> {
select?: TSelect;
where?: TWhere;
orderBy?: TOrderBy[]; // ← new orderBy support
}

CLI (sdk/constructive-cli)

• Help text includes --orderBy under "Find-First Options" (verified user.ts and others)
• handleFindFirst calls parseFindFirstArgs<FindFirstArgs<UserSelect, UserFilter, UserOrderBy>>(argv, defaultSelect)

React hooks (sdk/constructive-react)

• useUserQuery returns UseQueryResult<{ user: InferSelectResult<UserWithRelations, S> | null }>
• Delegates to getClient().user.findOne(...) — picks up the new singular shape transparently
• fetchUserQuery and prefetchUserQuery mirror the same contract

migrate-client SDK

Same pattern verified on SqlAction.findFirst — returns { sqlAction: ... | null } with SqlActionOrderBy type param.

Build + typecheck (already done)

• All 4 SDKs build clean
• tsc --noEmit passes with zero errors on all 4 SDKs
• 306 codegen tests pass, 119 snapshots green

[pyramation]

nice is this ready to review?

[yyyyaaa]

yep, pr ready