[Feature Request] Support repository-specific wildcards

[Kangie]

kangie@monolith ~ $ flaggie --version
flaggie 0.99.8

What I did

kangie@monolith ~ $ flaggie '*/*::haskell' '+kw::~amd64'

What I got

Traceback (most recent call last):
  File "/usr/lib/python-exec/python3.11/flaggie", line 8, in <module>
    sys.exit(entry_point())
             ^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/flaggie/__main__.py", line 367, in entry_point
    sys.exit(main(*sys.argv))
             ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/flaggie/__main__.py", line 337, in main
    operation.function(config_file, package, group, flag)
  File "/usr/lib/python3.11/site-packages/flaggie/mangle.py", line 281, in mangle_flag
    try_new_entry_after(new_line) or try_new_entry(new_line)
                                     ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/flaggie/mangle.py", line 263, in try_new_entry
    raise WildcardEntryError()
flaggie.mangle.WildcardEntryError: Adding wildcard entries other than */* is not supported

What I expected

diff --git a/etc/portage/package.accept_keywords/99local b/etc/portage/package.accept_keywordstmpaijlpnc2
index c603ae2..6a2dfb5 100644
--- a/etc/portage/package.accept_keywords/99local
+++ b/etc/portage/package.accept_keywordstmpaijlpnc2
@@ -1,2 +1,2 @@
{+*/*::haskell ~amd64+} 

It would be nice to be able to set keywords for a repository added through automation in a consistent manner!