fixing the typecheck fail when running convex dev for the first time

[mikecann]

Right now the project doesnt pass typecheck when you bunx convex dev

This fixes that by bumping the lib version to ES2023

see below, this PR now instead fixes the lines that cause this to fail when running under an es2021 typecheck

[vercel]

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[mikecann]

unfortunately right now the first run of convex dev will overwrite the tsconfig thus I have changed this to be back to es2021 instead of 2023 and instead fixed the lines that were using .at which is not in es2021

[steipete]

Closing as obsolete: on current main (2026-02-14), convex typecheck passes ( + ). This PR would also add generated Convex README/tsconfig churn we no longer need.

[steipete]

Clarification: verified with bunx convex dev --once and bunx tsc --project convex/tsconfig.json --noEmit on current main.