dream: middleware pipeline + logger + content-type sniffer + 20 tests

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plans/dream-on-sx.md

@@ -51,7 +51,7 @@ The five types: `request`, `response`, `handler = request -> response`, `middlew
       - `dream-router routes` — dispatch tree, returns handler; no match → 404.
       - Path param extraction: `:name` segments, `**` wildcard.
       - `dream-param req name` — retrieve matched path param.
-- [ ] **Middleware** in `lib/dream/middleware.sx`:
+- [x] **Middleware** in `lib/dream/middleware.sx`:
       - `dream-pipeline middlewares handler` — compose middleware left-to-right.
       - `dream-no-middleware` — identity.
       - Logger: `(dream-logger next req)` — logs method, path, status, timing.
@@ -121,6 +121,13 @@ Confirm scope before starting; some of these may be addable as Dream-internal he
   prefix and folds the middleware chain (`m1 @@ m2 @@ h`, first = outermost) onto each
   route's handler; nests correctly (inner mw innermost). Shared `dr/apply-middlewares`
   fold will back `dream-pipeline`.
+- **2026-06-07 — Middleware** (`lib/dream/middleware.sx`, 20 tests). `dream-pipeline`
+  (reuses `dr/apply-middlewares`), `dream-no-middleware` identity. `dream-logger-with
+  clock sink` is the testable core (records `{:method :path :status :elapsed}`);
+  `dream-logger` wires it to `(perform (:dream-clock))` / `(perform (:dream-log …))`;
+  `dream-log-line` formats one line. `dream-content-type` sniffs body (`<`→html,
+  `{`/`[`→json, else text) only when the handler left Content-Type unset. Bonus
+  `dream-set-header` and `dream-tap-request` combinators.
 
 ## Blockers