Keynote fixes/refinements (#4418)

# Description of Changes

Integrate the `keynote-2` benchmark template into the pnpm workspace so
it uses the local SpacetimeDB TypeScript SDK instead of a pinned npm
version.

- Add `templates/keynote-2` to `pnpm-workspace.yaml` and switch its
`spacetimedb` dependency to `workspace:*`
- Regenerate module bindings for SDK 2.0.1
- Update `DEVELOP.md`: bump Node.js prerequisite to ≥ 22.x (required by
the SDK's use of `Promise.withResolvers`), update CLI commands to use
`cargo run -p spacetimedb-cli --` for local development
- Fix `build` script: use `tsc` only (keynote-2 is a Node.js CLI app,
not a web app — `vite build` fails without an `index.html`)
- Fix demo results display: treat 0 TPS as a failure (`✗ FAILED`)
instead of showing it as a valid result and producing a nonsensical
"Infinityx FASTER" comparison
- Enable `LOG_ERRORS` by default in the demo so reducer failures are
immediately visible instead of silently producing 0 TPS
- Minor cleanup: fix unused variable warning in
`init_sqlite_seed_in_docker.ts`

# API and ABI breaking changes

None.

# Expected complexity level and risk

1 — Scoped entirely to the `keynote-2` template and its workspace
integration. No changes to the SDK, server, or any other template.

# Testing

- [ ] Run `pnpm install && pnpm --filter spacetimedb build` from repo
root
- [ ] Run `pnpm run demo -- --systems spacetimedb --seconds 3` from
`templates/keynote-2` against a local SpacetimeDB server and confirm
non-zero TPS
- [ ] Verify that a system producing 0 TPS shows `✗ FAILED` and is
excluded from the comparison chart
- [ ] Verify that reducer errors are printed to console during benchmark
failures

---------

Co-authored-by: clockwork-labs-bot <bot@clockworklabs.com>

Author: bradleyshep