fix(deps): update dependency rxjs to v7.8.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rxjs (source)	7.8.1 → 7.8.2

---

Release Notes

reactivex/rxjs (rxjs)

v7.8.2

Compare Source

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[NathanTarbert]

This one needs to move together with the AG-UI packages, so it's best not to merge it by itself.

The update gives the repo its own copy of rxjs 7.8.2. The @ag-ui/client version we use still brings in rxjs 7.8.1. That leaves two copies of rxjs installed side by side. TypeScript treats the Observable type from each copy as a different type, so our agents in apps/server/src/engine/ no longer match the AbstractAgent base class, and the type check fails.

The simplest path is to include this bump in the @ag-ui/* and @copilotkit/* upgrade that #162 is waiting on, so everything lands on the same rxjs at once. Pinning rxjs through a pnpm override would also work if we'd rather keep them separate.