fix: clojure test suite compatibility — 145/225 passing (64%)

Reader: #? reader conditionals with :default, #?@ splicing, char literals,
N/M suffix and ratio parsing, comma as whitespace, number parsing fix
for negative BigInt/Decimal/Ratio literals

Emitter: mangleName trailing/double underscore fixes, scope stack for
local var tracking, symbol-as-value emits cljSymbol() not bare identifier,
macro-expanded do-unwrap in processForm, emitBlock multiline wrap,
indentCode helper, when-var-exists emitter form, variadic apply fix,
fn proc spacing fix, def indent fix

Macros: deftest, is, testing, thrown?, are, when-var-exists builtins;
rewritten and/or using gensym; improved for/doseq/dotimes; cond->
and cond->> threading fixes; threading macro insert fixes

Runtime: sorted-map, sorted-set, sorted?, array-map, object-array,
hash-map, hash-set, inf, nan; assoc extended to vectors

Test runner: #?@ splice unwrapping, removed conflicting defmacro stubs

test_single.py

@@ -44,13 +44,16 @@ def extract_default(content, start):
         return rest[:k], k
 
 def strip_reader_conditionals(text):
-    """Strip #? and #?@ reader conditionals, keeping :default branch content."""
+    """Strip #? and #?@ reader conditionals, keeping :default branch content.
+    For #?@, if the default is a vector/list, unwrap it (splice semantics)."""
     result = []
     i = 0
     while i < len(text):
         # Check for #?@ or #?
+        is_splice = False
         if i + 3 <= len(text) and text[i:i+3] == '#?@':
             j = i + 3
+            is_splice = True
         elif i + 2 <= len(text) and text[i:i+2] == '#?':
             j = i + 2
         else:
@@ -85,6 +88,8 @@ def strip_reader_conditionals(text):
         # Extract content between parens
         inner = text[j+1:k]
         default_val, _ = extract_default(inner, 0)
+        if is_splice and len(default_val) >= 2 and default_val[0] in '([':
+            default_val = default_val[1:-1]
         result.append(default_val)
         i = k + 1
 
@@ -98,10 +103,6 @@ def run_test(cljc_path, timeout=30):
     content = re.sub(r'#\{[^}]*\}', r'@[]', content)  # #{} → @[]
     content = re.sub(r'#:([\w-]+)', r'\1', content)    # #:foo → foo
     stubs = '''(do
-(defmacro is [form] (list 'quote form))
-(defmacro testing [desc & body] (cons 'do body))
-(defmacro thrown? [form] (list 'try form false (list 'catch 'Exception 'e true)))
-(defmacro deftest [name & body] (list 'def name (cons 'fn (cons [] body))))
 '''
     content = stubs + content + ')'
     content = re.sub(r'clojure\.test', 'test', content)