fix(integrations): declare LingmaIntegration multi_install_safe

LingmaIntegration writes only to its isolated, static root .lingma/skills,
disjoint from every other integration, yet never declared
multi_install_safe — inheriting the IntegrationBase default False and
leaving `specify integration status` in a permanent unsafe-multi-install
ERROR state when lingma is co-installed alongside another agent.

Add `multi_install_safe = True`, mirroring the structurally-identical
trae/zcode SkillsIntegrations and the kiro-cli #3471 fix. The parametrized
registry isolation contracts auto-include lingma and pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jawwad-ali

src/specify_cli/integrations/lingma/__init__.py

@@ -27,6 +27,7 @@ class LingmaIntegration(SkillsIntegration):
         "args": "$ARGUMENTS",
         "extension": "/SKILL.md",
     }
+    multi_install_safe = True
 
     @classmethod
     def options(cls) -> list[IntegrationOption]:

tests/integrations/test_integration_lingma.py

@@ -1,5 +1,7 @@
 """Tests for LingmaIntegration."""
 
+from specify_cli.integrations import get_integration
+
 from .test_integration_base_skills import SkillsIntegrationTests
 
 
@@ -8,3 +10,9 @@ class TestLingmaIntegration(SkillsIntegrationTests):
     FOLDER = ".lingma/"
     COMMANDS_SUBDIR = "skills"
     REGISTRAR_DIR = ".lingma/skills"
+
+    def test_multi_install_safe(self):
+        # Lingma writes only to its isolated, static root .lingma/skills,
+        # disjoint from every other integration, so it must be co-install safe
+        # (mirrors trae/zcode and the kiro-cli #3471 precedent).
+        assert get_integration(self.KEY).multi_install_safe is True