[PATCH v4 0/3] support UTF-8 in alias names

This series enables UTF-8 and special characters in Git alias names by using config subsection syntax: `[alias "name"] command = value`. This allows non-English speakers to create aliases in their native languages while maintaining backward compatibility with the traditional syntax.

Changes since v3:

- Removed redundant !value check in data->alias branch, as Junio noted
  that git_config_string() already handles this case

- Added config_error_nonbool() in data->list branch so misconfigured
  aliases (without values) are caught immediately instead of silently
  adding broken entries that callers must handle

- Simplified code: consolidated error checking, removed conditional
  item->util assignment in favor of early error return

- Added test case for value-less alias error handling

- Improved test robustness by using intermediate file + test_grep
  instead of piping to grep

Jonatan Holmgren (3):
  help: use list_aliases() for alias listing
  alias: prepare for subsection aliases
  alias: support non-alphanumeric names via subsection syntax

 Documentation/config/alias.adoc | 43 ++++++++++++++++----
 alias.c                         | 38 ++++++++++++++++--
 help.c                          | 39 +++++++++---------
 t/t0014-alias.sh                | 71 +++++++++++++++++++++++++++++++++
 4 files changed, 159 insertions(+), 32 deletions(-)