Remove idempotency routing middleware layer and tests

Author: Copilot

idempotency/routing.lisp

@@ -8,7 +8,6 @@
                #:io.github.cl-sdk.wst.circuit-breaker.test
                #:io.github.cl-sdk.wst.rate-limit.test
                #:io.github.cl-sdk.wst.idempotency.test
-               #:io.github.cl-sdk.wst.idempotency.routing.test
                #:io.github.cl-sdk.wst.cors.test
                #:io.github.cl-sdk.wst.routing.woo.test
                #:io.github.cl-sdk.wst.routing.response.dsl.test

io.github.cl-sdk.wst.idempotency.routing.asd

@@ -19,7 +19,7 @@ Behavior is built from pipelines and composition, where middleware and handlers
 - CORS middleware
 - Static file routing
 - Rate limiting with pluggable stores
-- Idempotency-key middleware with replay and conflict handling
+- Idempotency core lifecycle API with pluggable stores
 - Circuit breaker core and routing middleware integration
 - Accept-aware response selection helpers (`io.github.cl-sdk.wst.request-accept`)
 - W3C Trace Context propagation (`traceparent`/`tracestate`) with routing adapter (`io.github.cl-sdk.wst.trace-context`)