test: add tests for cmd_key preservation through name clamping

- TestClampCommandNamesTriples: unit tests for 3-tuple support in
  _clamp_command_names (short names, long names, collisions, multiple
  entries, backward compat with 2-tuples)
- TestDiscordSkillCmdKeyDispatch: integration test through the full
  discord_skill_commands pipeline verifying long skill names retain
  their original cmd_key after clamping
- Add contributor CharlieKerfoot to AUTHOR_MAP

scripts/release.py

@@ -673,6 +673,7 @@ AUTHOR_MAP = {
     "web3blind@gmail.com": "web3blind",
     "ztzheng@163.com": "chengoak",  # PR #17467
     "24110240104@m.fudan.edu.cn": "YuShu",  # co-author only
+    "charliekerfoot@gmail.com": "CharlieKerfoot",  # PR #18951
 }