chore(quickjs): rename to REPLMiddleware and adjust defaults (#520)

### Summary

- Rename `createQuickJSMiddleware` → `createREPLMiddleware` and
`QuickJSMiddlewareOptions` → `REPLMiddlewareOptions` to match the Python
`REPLMiddleware` naming
- Rename middleware registration from `"QuickJSMiddleware"` →
`"REPLMiddleware"`
- Rename default tool name from `"js_eval"` → `"eval"`, now configurable
via `toolName` option
- Add `captureConsole` option (default `true`) to toggle console output
capture
- Align default memory limit to 64 MiB (was 50 MiB) and timeout to 5s
(was 30s) to match Python

### Tests

- All 156 existing unit tests pass with updated references
- Updated `middleware.test.ts`, `middleware.int.test.ts`, and example
files to use new names

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Co-authored-by: Hunter Lovell <40191806+hntrl@users.noreply.github.com>