bun: Stale comment in `getPerformanceIntegrations`

`packages/bun/src/sdk.ts:29` says the function swaps in the orchestrion subscribers "*only* when the orchestrion channels were actually injected". The body has no such condition; it returns `getTracingIntegrations()` unconditionally. Either the gate was dropped or the comment is left over.

**Work item.** Decide which is right. If unconditional is intended, rewrite the comment. If the gate was intended, note that it interacts with B2: gating would turn the silent no-op into an honest empty set.

Start in packages/bun/src/sdk.ts:29 and inspect getPerformanceIntegrations alongside getTracingIntegrations. Review the B2 interaction described in the issue, then determine whether unconditional behavior or gating is intended; update the comment or behavior accordingly and verify that the resulting integrations behavior matches the decision.

索引モデルが issue の本文から書いたものです。