feat(opencode): add --skills support to opencode integration

Adds opt-in `--skills` support to OpencodeIntegration, producing `speckit-<name>/SKILL.md` files under `.opencode/skills/` instead of flat `.md` files.
Opencode natively supports this format (https://opencode.ai/docs/skills/).

Activate via: `specify init --integration opencode --integration-options="--skills"`

Author: tinesoft

src/specify_cli/integrations/opencode/__init__.py

@@ -1,6 +1,12 @@
 """opencode integration."""
 
-from ..base import MarkdownIntegration
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+from ..base import IntegrationOption, MarkdownIntegration, SkillsIntegration
+from ..manifest import IntegrationManifest
 
 
 class OpencodeIntegration(MarkdownIntegration):
@@ -20,6 +26,38 @@ class OpencodeIntegration(MarkdownIntegration):
     }
     context_file = "AGENTS.md"
 
+    @classmethod
+    def options(cls) -> list[IntegrationOption]:
+        return [
+            IntegrationOption(
+                "--skills",
+                is_flag=True,
+                default=False,
+                help="Scaffold commands as agent skills (speckit-<name>/SKILL.md) instead of .md files",
+            ),
+        ]
+
+    def setup(
+        self,
+        project_root: Path,
+        manifest: IntegrationManifest,
+        parsed_options: dict[str, Any] | None = None,
+        **opts: Any,
+    ) -> list[Path]:
+        if (parsed_options or {}).get("skills"):
+            helper = SkillsIntegration()
+            helper.key = self.key
+            helper.config = {**self.config, "commands_subdir": "skills"}
+            helper.registrar_config = {
+                "dir": ".opencode/skills",
+                "format": "markdown",
+                "args": "$ARGUMENTS",
+                "extension": "/SKILL.md",
+            }
+            helper.context_file = self.context_file
+            return helper.setup(project_root, manifest, parsed_options, **opts)
+        return super().setup(project_root, manifest, parsed_options, **opts)
+
     def build_exec_args(
         self,
         prompt: str,

tests/integrations/test_integration_opencode.py

@@ -1,6 +1,9 @@
 """Tests for OpencodeIntegration."""
 
+import yaml
+
 from specify_cli.integrations import get_integration
+from specify_cli.integrations.manifest import IntegrationManifest
 
 from .test_integration_base_markdown import MarkdownIntegrationTests
 
@@ -57,3 +60,66 @@ def test_build_exec_args_keeps_plain_prompt_dispatch(self):
         args = integration.build_exec_args("explain this repository", output_json=False)
 
         assert args == ["opencode", "run", "explain this repository"]
+
+
+class TestOpencodeSkillsMode:
+    KEY = "opencode"
+
+    def test_skills_option_declared(self):
+        integration = get_integration(self.KEY)
+        opts = integration.options()
+        names = [o.name for o in opts]
+        assert "--skills" in names
+        skills_opt = next(o for o in opts if o.name == "--skills")
+        assert skills_opt.is_flag is True
+        assert skills_opt.default is False
+
+    def test_skills_mode_creates_skill_md_files(self, tmp_path):
+        integration = get_integration(self.KEY)
+        manifest = IntegrationManifest(self.KEY, tmp_path)
+        created = integration.setup(tmp_path, manifest, parsed_options={"skills": True}, script_type="sh")
+
+        skill_files = [p for p in created if p.name == "SKILL.md"]
+        assert skill_files
+
+        skills_dir = tmp_path / ".opencode" / "skills"
+        assert skills_dir.is_dir()
+
+        specify_skill = skills_dir / "speckit-specify" / "SKILL.md"
+        assert specify_skill.exists()
+
+    def test_skills_mode_does_not_create_md_command_files(self, tmp_path):
+        integration = get_integration(self.KEY)
+        manifest = IntegrationManifest(self.KEY, tmp_path)
+        integration.setup(tmp_path, manifest, parsed_options={"skills": True}, script_type="sh")
+
+        command_dir = tmp_path / ".opencode" / "command"
+        md_files = list(command_dir.glob("*.md")) if command_dir.exists() else []
+        assert md_files == []
+
+    def test_skills_mode_frontmatter(self, tmp_path):
+        integration = get_integration(self.KEY)
+        manifest = IntegrationManifest(self.KEY, tmp_path)
+        integration.setup(tmp_path, manifest, parsed_options={"skills": True}, script_type="sh")
+
+        skill_path = tmp_path / ".opencode" / "skills" / "speckit-plan" / "SKILL.md"
+        assert skill_path.exists()
+
+        content = skill_path.read_text(encoding="utf-8")
+        parts = content.split("---", 2)
+        parsed = yaml.safe_load(parts[1])
+
+        assert parsed["name"] == "speckit-plan"
+        assert "description" in parsed
+        assert "compatibility" in parsed
+        assert parsed["metadata"]["author"] == "github-spec-kit"
+
+    def test_default_mode_unchanged(self, tmp_path):
+        integration = get_integration(self.KEY)
+        manifest = IntegrationManifest(self.KEY, tmp_path)
+        integration.setup(tmp_path, manifest, script_type="sh")
+
+        command_dir = tmp_path / ".opencode" / "command"
+        assert command_dir.is_dir()
+        md_files = list(command_dir.glob("*.md"))
+        assert md_files