# Implementation Spec: Round 7 — COMPLETE

3 fitur implementasi selesai:
- `BgJoiner` (core, lifecycle) — graceful task join, 2 tests
- `MiddlewarePipeline` (core, observability+resiliency) — composable async mw stack, 2 tests
- `RateLimitedQueue` (queue) — token-bucket rate-limited enqueue wrapper, 2 tests + QueueError::RateLimit variant

Build: `cargo build --workspace --all-features` exit 0.
Tests: semua pass (0 FAILED).
Clippy: 0 new warnings.