compiler: resolve :as aliases in macro detection; fix analyzer compile-ns

- compiler/resolve-macro now resolves :as aliases (like resolve-var), so aliased
  macro calls (t/is) are recognized and compiled via expansion instead of falling
  back. Compile-mode suite holds at 3932.
- host/current-ns reads a backend-stashed :compile-ns rather than ctx-current-ns:
  the interpreter rebinds current-ns to a fn's defining ns while it runs, so the
  interpreted analyzer (defined in jolt.analyzer) would otherwise mis-resolve the
  user's compile ns. Fixes def/intern targeting the wrong namespace.

Analyzer stays interpreted (compiling it needs qualified-ref compilation, which
regresses the clojure.test shim — jolt-4xc). Self-host pipeline correct (218/218),
full suite green.

src/jolt/backend.janet

@@ -157,10 +157,10 @@
 
 (defn- ensure-analyzer [ctx]
   # Load jolt.analyzer (and transitively jolt.ir) once; jolt.host is pre-installed
-  # by host/install! so its require is a no-op. The analyzer currently runs
-  # INTERPRETED — compiling it via the bootstrap is blocked by bootstrap
-  # miscompilation bugs on the constructs it uses (tracked); correctness is fine,
-  # speed is the open item.
+  # by host/install! so its require is a no-op. The analyzer runs INTERPRETED:
+  # compiling it via the bootstrap needs qualified-ref compilation, which
+  # regresses compile mode (the clojure.test shim breaks) — tracked in jolt-4xc.
+  # Correctness is unaffected (218/218 conformance); speed is the open item.
   (when (= 0 (length ((ctx-find-ns ctx "jolt.analyzer") :mappings)))
     (eval-form ctx @{} (r/parse-string "(require '[jolt.analyzer])"))))
 
@@ -169,8 +169,14 @@
   returning host-neutral IR."
   [ctx form]
   (ensure-analyzer ctx)
+  # Capture the real compile ns: the analyzer runs interpreted (defined in
+  # jolt.analyzer), and the interpreter rebinds current-ns to a fn's defining ns
+  # while it runs — so h/current-ns must read this instead of ctx-current-ns.
+  (put (ctx :env) :compile-ns (ctx-current-ns ctx))
   (def av (ns-find (ctx-find-ns ctx "jolt.analyzer") "analyze"))
-  ((var-get av) ctx form))
+  (def r ((var-get av) ctx form))
+  (put (ctx :env) :compile-ns nil)
+  r)
 
 (defn compile-and-eval
   "Self-hosted compile path: analyze (portable Clojure) -> IR -> Janet -> eval.

src/jolt/compiler.janet

@@ -184,7 +184,12 @@
     (let [name (sym-s :name)
           ns-sym (sym-s :ns)]
       (if ns-sym
-        (let [target-ns (ctx-find-ns ctx ns-sym)
+        # Resolve :as aliases (e.g. (t/is …) where t aliases clojure.test) so
+        # aliased macros are recognized as macros — matching the interpreter's
+        # resolve-var — rather than miscompiled as a value ref to the macro var.
+        (let [cur (ctx-find-ns ctx (ctx-current-ns ctx))
+              aliased (ns-import-lookup cur ns-sym)
+              target-ns (ctx-find-ns ctx (or aliased ns-sym))
               v (ns-find target-ns name)]
           (if (and v (var-macro? v)) v))
         (let [current-ns-name (ctx-current-ns ctx)

src/jolt/host_iface.janet

@@ -74,7 +74,11 @@
 
 (defn h-special? [name] (if (get special-names name) true false))
 
-(defn h-current-ns [ctx] (ctx-current-ns ctx))
+# The namespace being compiled. NOT ctx-current-ns directly: the interpreter
+# rebinds current-ns to a fn's defining ns while that fn runs, so an interpreted
+# analyzer (defined in jolt.analyzer) would otherwise see jolt.analyzer. The back
+# end stashes the real compile ns in :compile-ns before invoking the analyzer.
+(defn h-current-ns [ctx] (or (get (ctx :env) :compile-ns) (ctx-current-ns ctx)))
 
 (defn h-macro? [ctx sym]
   (let [v (resolve-var ctx @{} sym)]