feat(extraction): add Common Lisp support via hand-rolled s-expressio…

[cyclistmass]

…n parser

Adds Common Lisp / Emacs Lisp (.lisp, .lsp, .cl, .asd, .el) as a custom extractor — a dedicated tokenizer + recursive-descent s-expression parser, no tree-sitter grammar and no source preprocessing. The atom reader consumes up to whitespace/delimiter, so ^, {}[], backslash escapes, package- qualified symbols, reader conditionals, #'/#\/#x dispatch, nested #|...|# comments, format-directive strings, and mid-symbol # all parse correctly with zero special-casing.

Extracts: defun/defmacro/defgeneric (functions); defmethod (method with CLOS receiver-typed qualified name + :before/:after/:around qualifier disambig + contains-edge from its class); defclass/define-condition (class + slot fields

• :accessor/:reader/:writer functions + extends edges); defstruct; deftype; defvar/defparameter/defconstant; defpackage (namespace + :use/:import-from imports + :export exports); (require ...) imports; and context-aware call edges that suppress binding-form names (let/do/dolist/multiple-value-bind/...), declaration specifiers, cond/case literal keys, and resolve funcall/apply/ CCL's (! vinsn) indirection to the real target. Top-level def* DSL macros (def-x86-opcode, define-arm-vinsn, defcommand, deftest, ...) surface their defined symbol.

Validated on the Clozure ANSI regression suite (ccl-tests, 867 files / 170k lines): zero parse errors, 24,751 nodes, 99.97% of top-level deftest forms extracted. Cross-checked against CCL's own tools/vinsn-xref.py on the ARM64 port: identical caller results (e.g. save-values -> its 3 call sites).