common-lisp: Phase 1 reader + 62 tests (141 total)

lib/common-lisp/parser.sx — cl-read/cl-read-all: lists, dotted
pairs (a . b) → cons dict, quote/backquote/unquote/splice as
wrapper lists, #' → FUNCTION, #(…) → vector dict, #:foo →
uninterned dict, NIL→nil, T→true, integer radix conversion
(#xFF/#b1010/#o17). Floats/ratios kept as annotated dicts.

lib/common-lisp/tests/parse.sx — 62 tests, all green.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/common-lisp/test.sh

@@ -43,6 +43,7 @@ for FILE in "${FILES[@]}"; do
   cat > "$TMPFILE" <<EPOCHS
 (epoch 1)
 (load "lib/common-lisp/reader.sx")
+(load "lib/common-lisp/parser.sx")
 (epoch 2)
 (load "$FILE")
 (epoch 3)
@@ -75,6 +76,7 @@ EPOCHS
     cat > "$TMPFILE2" <<EPOCHS
 (epoch 1)
 (load "lib/common-lisp/reader.sx")
+(load "lib/common-lisp/parser.sx")
 (epoch 2)
 (load "$FILE")
 (epoch 3)