Forge installs its slash-commands with hyphenated names (speckit-foo-bar, via
format_forge_command_name and the injected frontmatter name), but
ForgeIntegration inherited MarkdownIntegration.build_command_invocation, which
builds the dotted /speckit.<cmd>. So 'workflow'/command dispatch invoked
/speckit.plan while the registered command is /speckit-plan — a name Forge never
registered.
Override build_command_invocation to reuse format_forge_command_name, producing
/speckit-<name> (with '.'-to-'-' for extension commands), mirroring the skills
agents' hyphenated invocation.
Tests assert Forge 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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