dream: router dispatch + path params + scopes + 27 tests

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

plans/dream-on-sx.md

@@ -45,7 +45,7 @@ The user-facing story: rose-ash users who'd never touch s-expressions might writ
 The five types: `request`, `response`, `handler = request -> response`, `middleware = handler -> handler`, `route`. Everything else is a function over these.
 
 - [x] **Core types** in `lib/dream/types.sx`: request/response records, route record.
-- [ ] **Router** in `lib/dream/router.sx`:
+- [x] **Router** in `lib/dream/router.sx`:
       - `dream-get path handler`, `dream-post path handler`, etc. for all HTTP methods.
       - `dream-scope prefix middlewares routes` — prefix mount with middleware chain.
       - `dream-router routes` — dispatch tree, returns handler; no match → 404.
@@ -112,6 +112,15 @@ Confirm scope before starting; some of these may be addable as Dream-internal he
   constructors + accessors; smart response constructors (html/text/json/empty/
   not-found/redirect); `dream-coerce-response` wraps bare strings; query-string
   parsing. Conformance runner `lib/dream/conformance.sh` modelled on flow's.
+- **2026-06-07 — Router** (`lib/dream/router.sx`, 27 tests). `dream-get/post/put/
+  delete/patch/head/options/any` route constructors; `dream-router` flattens routes
+  (incl. nested scopes) and dispatches by method+path, first-match-wins, 404 on no
+  match. Path matching is recursive over `/`-split segments: literal, `:name` binds
+  a param, `**` catch-all binds remaining path under key `"**"`. Trailing slashes and
+  query strings are ignored for routing. `dream-scope prefix mws routes` prepends the
+  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`.
 
 ## Blockers