Cline installs its slash-commands with hyphenated names (speckit-plan,
speckit-git-commit) via format_cline_command_name + the hyphenated
command_filename, but ClineIntegration inherited MarkdownIntegration's
build_command_invocation, which builds the dotted /speckit.<cmd> — a name Cline
never registered.
Add a build_command_invocation override reusing format_cline_command_name,
producing /speckit-<name>, mirroring the ForgeIntegration fix. Cline was the only
remaining markdown integration with invoke_separator='-' + hyphenated
command_filename that lacked the override.
Tests assert Cline core + extension invocations are hyphenated, incl. args
(fail before: dotted /speckit.plan / /speckit.git.commit).
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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