Document IndexedDB delete/read sync boundary

[issackjohn]

Follow-up for local issue 53.

This documents the delete/read synchronization boundary in the IndexedDB workload and removes the hard-coded 9 page-transition check.

Research summary:

• TodoApp.moveToPreviousPage() awaits todo-list.moveToPreviousPage() before dispatching previous-page-loaded.
• todo-list.moveToPreviousPage() awaits storageManager.getTodos(...), so previous-page-loaded means the previous page read has completed.
• Each previous-page read fetches lower item numbers than the page just deleted, so it does not race the pending delete writes for the just-deleted page.
• FinishDeletingItemsFromDB still waits for all delete transactions before the suite advances.

Validation:

• git diff --check

Note: local Node/npm tooling was not available in this shell, so browser CI should cover the end-to-end validation.

[Copilot]

Pull request overview

This PR documents the delete/read synchronization boundary in the IndexedDB TodoMVC workload and makes the “previous page” transition conditional on the configured iteration count instead of a hard-coded constant, aligning the control flow with the workload’s loop bounds.

Changes:

• Replace the hard-coded j < 9 guard with j < numberOfIterations - 1 for the delete loop’s previous-page transition.
• Add inline documentation explaining why the previous-page read does not race the just-triggered delete writes, and that the suite still waits for all deletes via FinishDeletingItemsFromDB.
• Mirror the same update into the built dist copy of the workload.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
experimental/javascript-wc-indexeddb/src/workload-test.mjs	Removes hard-coded iteration boundary for delete paging and documents the delete/read sync boundary.
experimental/javascript-wc-indexeddb/dist/src/workload-test.mjs	Propagates the same boundary fix and documentation to the distribution artifact.

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