fix: apply hook-invocation note to generic --skills SKILL.md output

_build_skill_content() duplicated SkillsIntegration.setup()'s per-file
body but dropped the call to post_process_skill_content(), which
injects the dot-to-hyphen hook-invocation note before every "For each
executable hook" instruction. Without it, a configured extension hook
(e.g. speckit.git.commit) would be invoked verbatim as
/speckit.git.commit, which doesn't exist under the
speckit-<name>/SKILL.md layout this feature introduces.

Add a small _GenericSkillsHelper(SkillsIntegration) — the same
delegation pattern CopilotIntegration uses for its own skills mode —
and call its post_process_skill_content() after building the SKILL.md
body. Add a regression test asserting the note appears.

Author: chelsealong

src/specify_cli/integrations/generic/__init__.py

@@ -14,10 +14,23 @@
 
 import yaml
 
-from ..base import IntegrationOption, MarkdownIntegration, yaml_quote
+from ..base import IntegrationOption, MarkdownIntegration, SkillsIntegration, yaml_quote
 from ..manifest import IntegrationManifest
 
 
+class _GenericSkillsHelper(SkillsIntegration):
+    """Internal helper supplying skills-mode post-processing for
+    ``GenericIntegration`` (e.g. the dot-to-hyphen hook invocation note).
+
+    Not registered in the integration registry — ``GenericIntegration``
+    itself renders skills content directly in ``_build_skill_content()``
+    and only delegates to this helper's ``post_process_skill_content()``,
+    mirroring the pattern ``CopilotIntegration`` uses for its skills mode.
+    """
+
+    key = "generic"
+
+
 class GenericIntegration(MarkdownIntegration):
     """Integration for user-specified (generic) agents."""
 
@@ -156,6 +169,7 @@ def _build_skill_content(
             f"---\n"
             f"{processed_body}"
         )
+        skill_content = _GenericSkillsHelper().post_process_skill_content(skill_content)
         return skill_name, skill_content
 
     def commands_dest(self, project_root: Path) -> Path:

tests/integrations/test_integration_generic.py

@@ -253,6 +253,26 @@ def test_skill_content_has_expected_frontmatter(self, tmp_path):
         assert "__AGENT__" not in content
         assert "__SPECKIT_COMMAND_" not in content
 
+    def test_skill_content_has_hook_command_note(self, tmp_path):
+        """SKILL.md bodies get the shared dot-to-hyphen hook invocation
+        note, matching what SkillsIntegration.setup() produces for other
+        skills-format agents (e.g. Claude)."""
+        i = get_integration("generic")
+        m = IntegrationManifest("generic", tmp_path)
+        i.setup(
+            tmp_path, m,
+            parsed_options={"commands_dir": ".myagent/skills", "skills": True},
+        )
+        constitution_skill = (
+            tmp_path / ".myagent" / "skills" / "speckit-constitution" / "SKILL.md"
+        )
+        assert constitution_skill.exists()
+        content = constitution_skill.read_text(encoding="utf-8")
+        assert (
+            "replace dots (`.`) with hyphens (`-`)" in content
+        ), "generic --skills output is missing the hook-invocation note"
+        assert "`speckit.git.commit` → `/speckit-git-commit`" in content
+
     def test_skills_flag_false_keeps_flat_markdown(self, tmp_path):
         """Without --skills, behavior is unchanged: flat speckit.<name>.md files."""
         i = get_integration("generic")