# Implementation Spec: Round 5

## Status: COMPLETE

## New Features

### 1. CircuitBreakerHealthCheck (mytheclipse-core, observability+resiliency)
- `CircuitBreakerHealthCheck` di metrics_bridge.rs — HealthCheck impl yang memetakan CircuitBreaker snapshot state → HealthStatus (Open→Unhealthy, HalfOpen→Degraded, Closed→Ok)
- Gated `#[cfg(feature="resiliency")]`; re-export gated `#[cfg(all(observability, resiliency))]`
- `observability` feature now implies `lifecycle` (needed for crate::health module access)

### 2. TypedKeyRegistry (mytheclipse-crypto, password)
- `TypedKeyRegistry<K,V>` di key_registry.rs — ID-based key lookup + rotation + revoke, wraps KeyRing
- `key_for(id) -> Option<&K>`, `rotate_with_id(id, key)`, `revoke(id)`

### 3. MetricsHttpHandler (mytheclipse-http, metrics-http)
- new feature `metrics-http` (axum + tower + mytheclipse/observability)
- `metrics_routes(collector)` → Router serving /metrics (Prometheus text) + /
- added tower dep (util), ServiceExt import in test module
- 1 test via ServiceExt::oneshot

### 4. BatchProcessor (mytheclipse-queue, in-memory)
- `BatchJobHandler` trait — handle Vec<Job> atomically
- `BatchConfig` { batch_size, batch_timeout, concurrency }
- `BatchProcessor<Q>` — accumulates jobs per topic, flushes on size/timeout
- 2 tests: flush_on_batch_size, flush_on_timeout

## Verification
- cargo build --workspace --all-features → exit 0
- cargo test --workspace --all-features → all pass (160+ tests)
- cargo clippy --workspace --all-features → no new warnings
- commit + push: f02a1ce