fix(integrations): Cline dispatches hyphenated /speckit-<cmd> invocations (#3622)

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>

src/specify_cli/integrations/cline/__init__.py

@@ -77,6 +77,19 @@ class ClineIntegration(MarkdownIntegration):
         """Cline uses hyphenated filenames (e.g. speckit-git-commit.md)."""
         return format_cline_command_name(template_name) + ".md"
 
+    def build_command_invocation(self, command_name: str, args: str = "") -> str:
+        """Cline installs hyphenated slash-commands (``/speckit-<name>``), so the
+        dispatch invocation must match. The inherited MarkdownIntegration default
+        builds the dotted ``/speckit.<name>``, which references a command Cline
+        never registered. Reuse the same hyphenation as command_filename /
+        the injected frontmatter name (see ``format_cline_command_name``),
+        mirroring the forge integration.
+        """
+        invocation = "/" + format_cline_command_name(command_name)
+        if args:
+            invocation = f"{invocation} {args}"
+        return invocation
+
     def process_template(self, *args, **kwargs):
         """Ensure shared templates render Cline command references with hyphens."""
         kwargs.setdefault("invoke_separator", self.invoke_separator)