fix(skills): stop marking persisted env vars missing on remote backends (#3650)

Salvage of PR #3452 (kentimsit). Fixes skill readiness checks on remote backends — persisted env vars are no longer incorrectly marked as missing.

Co-Authored-By: kentimsit <kentimsit@users.noreply.github.com>

tests/tools/test_skill_env_passthrough.py

@@ -63,6 +63,35 @@ class TestSkillViewRegistersPassthrough:
         assert result["success"] is True
         assert is_env_passthrough("TENOR_API_KEY")
 
+    def test_remote_backend_persisted_env_vars_registered(self, tmp_path, monkeypatch):
+        """Remote-backed skills still register locally available env vars."""
+        monkeypatch.setenv("TERMINAL_ENV", "docker")
+        _create_skill(
+            tmp_path,
+            "test-skill",
+            frontmatter_extra=(
+                "required_environment_variables:\n"
+                "  - name: TENOR_API_KEY\n"
+                "    prompt: Enter your Tenor API key\n"
+            ),
+        )
+        monkeypatch.setattr("tools.skills_tool.SKILLS_DIR", tmp_path)
+
+        from hermes_cli.config import save_env_value
+
+        save_env_value("TENOR_API_KEY", "persisted-value-123")
+        monkeypatch.delenv("TENOR_API_KEY", raising=False)
+
+        with patch("tools.skills_tool._secret_capture_callback", None):
+            from tools.skills_tool import skill_view
+
+            result = json.loads(skill_view(name="test-skill"))
+
+        assert result["success"] is True
+        assert result["setup_needed"] is False
+        assert result["missing_required_environment_variables"] == []
+        assert is_env_passthrough("TENOR_API_KEY")
+
     def test_missing_env_vars_not_registered(self, tmp_path, monkeypatch):
         """When a skill declares required_environment_variables but the var is NOT set,
         it should NOT be registered in the passthrough."""