Skill core

This is a non-selectable dependency. Its ${CLAUDE_SKILL_DIR}/scripts/ folder holds Python modules that other skills' scripts import, such as console.py, whose runner starts every entry point with UTF-8 output and ends an unhandled failure with a FAILED line, frontmatter.py, which reads a SKILL.md or agent definition's frontmatter, github_client.py, the GitHub CLI client every gh call goes through, git_client.py, the git client, both bounded and kept from prompting by bounded_process.py, skill_roots.py, the directories the deployer installs skills in and the lookup of a sibling skill's scripts that every dependent puts on sys.path, flat_text.py, which flattens free text onto one line, folder_walk.py, the one walk of a repository's folders for files by name, which enters no junction or symbolic link its caller does not follow and skips one stated set of folders and every nested checkout, diff_paths.py, which decodes the paths a git diff's file headers name, typed_fields.py, the reader of a JSON field's kind that the code-review pipeline's and the pull request tracker's validators and the GitHub activity report share, whole_number.py, the one reader of a whole number from text, which takes ASCII digits alone up to the digit limit json_reader.py also holds, nesting_depth.py, the one bound on how deep a reader descends, which json_reader.py and xml_reader.py hold and a recursive parser checks at each level, versions.py, the one reader of a version number, which compares versions by their numbers, python_reader.py, the one parse of Python source and of a Python literal, which refuses source nested past the parser's limits as it refuses a syntax error, path_keys.py, the one form a path is compared in, json_writer.py, the one writer of JSON text, whether bound for a file, a prompt, a hook's output, or a message, which refuses at the write a non-finite number, a lone surrogate, and what json_reader.py would refuse reading it back, and xml_reader.py, which parses untrusted XML into an element tree after refusing a DOCTYPE or ENTITY declaration. It has no workflow to run.