registerCommonTasks() has no declared return type, so any membership test is a TS2345 — builder main is red on it

[sroussey]

packages/tasks/src/browser.ts:23-28 declares no return type:

export const registerCommonTasks = () => { … return [...tasks, FileGrepTask, FileLoaderTask, FileSedTask]; }

The inferred element type is a union of ~58 concrete task classes whose static inputSchema() return types are literal-inferred and mutually unassignable. Any consumer asking "is X in this set" is therefore a type error.

workglow-dev/builder@1ed0a224 fails bun run types with:

packages/app/src/components/task/systemTasks.ts(30,105): error TS2345:
Argument of type 'typeof FileGrepTask | typeof FileLoaderTask | typeof FileSedTask' is not assignable …
Type 'DataPortSchema' is not assignable to type '{ readonly type: "object"; readonly properties: {}; readonly additionalProperties: true; }'.

builder's main has been red on this since 2026-08-20 (runs 1506, 1509–1512), across three further commits including two dependency bumps.

This also violates the repo's own convention ("Declare return types on top-level module functions"). Annotating it ITaskConstructor[] is a one-line fix with no behaviour change, and prevents the same trap for every other consumer.

Found during the 2026-08-24 review. Snapshot: workglow-dev/prd → analysis/grades/2026-08-24/cross-repo-integration.md.