feat: round-8 abstractions — ResilientHttpClient, MiddlewarePipeline, BgJoiner

.hermes/plans/mytheclipse-round8-spec.md

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+# Implementation Spec: Round 8 — COMPLETE
+
+## New Feature
+
+### ResilientHttpClient (mytheclipse-http, resilience)
+File: `crates/mytheclipse-http/src/resilient_client.rs`
+- `ResilientHttpClient` — reqwest Client + ServiceBuilder pipeline (retry/circuit/timeout)
+- `ResilientClientConfig` — timeout, max_attempts, rate, circuit_breaker
+- `send(req)` / `get(url)` / `post(url, body)` — all run through ServiceBuilder::run
+- Error type `RunError<Box<dyn Error>>` (HttpError alias)
+- 2 tests
+
+## Modified
+- http/Cargo.toml: +resilience feature, mytheclipse dep features=full
+- http/lib.rs: +module +export
+- core/lib.rs: pub use RunError, ServiceConfig from service_builder
+
+Build: exit 0. Tests: 0 FAILED. Clippy: 0 new warnings.