[Bug Bash] P3: core: redundant --hotswap flag passed to `cdk watch` in sandbox

[vishaalmehrishi]

Priority: P3 · Package: core

npm run sandbox spawns cdk watch with an explicit --hotswap flag. Since cdk watch already implies hotswap, the extra flag is redundant and can emit a benign "unknown/duplicate option"-style warning on some aws-cdk CLI versions. Cosmetic (stderr is surfaced as [CDK Watch] ...), not a failure.

Verified present on main (e98bab4, 2026-06-19).

packages/core/src/scripts/sandbox.ts#L142-L143

const cdkWatch = spawnCommand("npx", [
  "cdk", "watch", "--hotswap",   // ← redundant; cdk watch already hotswaps
  ...
]);

Confidence

Low — the exact warning text is aws-cdk CLI-version-dependent and was not reproduced.

Fix

A ~2-minute local run against the pinned aws-cdk version; if --hotswap warns, drop the redundant flag from the cdk watch invocation in sandbox.ts.