Write, review, and test Emacs Lisp code following idiomatic conventions and hard-won local best practices. Use when writing, editing, debugging, or reviewing .el files, Emacs packages, or gptel tools. Enforces a mandatory verify-before-deliver rule - all written code must be batch byte-compiled and smoke-tested before presenting to the user. Covers load-path management, buffer-local variable safety, HTML/XML parsing, file I/O patterns, and batch testing workflows.
