fix: 70% test suite pass rate (164/233)

Emitter: iterative worklist-based form processing (no more stack overflow),
type conversion functions (float/int/double/long/short/byte/boolean),
metadata stripping in def/defn/defn-, to-array runtime mapping

Macros: namespace-qualified macro resolution (t/deftest -> deftest),
when-var-exists macro restored, are/testing/is/thrown? built-in macros

Runtime: cljToFloat, cljToInt, cljToBool, cljToArray conversion wrappers,
cljVolatileBang, cljDeliver, cljDoall, cljDorun, cljDropLast,
cljShuffle, cljFnil, cljIntern stubs

Results: 164/233 passed (70%)
  clojure.string: 8/8 (100%)
  clojure.core: 156/225 (69%)

src/macros.nim

@@ -88,9 +88,14 @@ proc macroexpand1*(form: CljVal): CljVal =
     if form.items.len != 2:
       raise newException(CatchableError, "syntax-quote requires exactly 1 argument")
     return expandSyntaxQuote(form.items[1])
-  # Check if it's a macro
+  # Check if it's a macro (try full name, then bare name without namespace prefix)
   if isMacro(name):
     return expandMacro(name, form.items[1..^1])
+  let slashPos = name.find('/')
+  if slashPos > 0:
+    let bareName = name[slashPos+1..^1]
+    if isMacro(bareName):
+      return expandMacro(bareName, form.items[1..^1])
   return form
 
 proc macroexpand*(form: CljVal): CljVal =
@@ -514,6 +519,7 @@ proc initMacros*() =
     return cljList(@[cljSymbol("do")] & isForms)
   )
 
+  # when-var-exists: always expands body (var check is compile-time in emitter)
   defineMacro("when-var-exists", proc(args: seq[CljVal]): CljVal =
     if args.len < 2:
       raise newException(CatchableError, "when-var-exists requires symbol and body")