feat(tasks): add skill-templated task graph execution

app-instance/backend/tests/unit/test_skill_team_template.py

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+from __future__ import annotations
+
+from beaver.skills.assembler.task_assembler import SkillAssembler
+from beaver.skills.catalog.loader import SkillsLoader
+from beaver.skills.catalog.utils import extract_skill_team_template
+
+
+def test_extract_team_template_returns_none_when_block_is_absent() -> None:
+    result = extract_skill_team_template("# Ordinary Skill")
+
+    assert result.template is None
+    assert result.warnings == []
+
+
+def test_extract_team_template_parses_valid_json_block() -> None:
+    result = extract_skill_team_template(
+        "```beaver-team-template\n"
+        '{"version": 1, "nodes": [{"node_id": "collect", "task": "Collect"}]}\n'
+        "```"
+    )
+
+    assert result.template == {
+        "version": 1,
+        "nodes": [{"node_id": "collect", "task": "Collect"}],
+    }
+    assert result.warnings == []
+
+
+def test_invalid_template_is_warning_not_skill_load_failure() -> None:
+    result = extract_skill_team_template("```beaver-team-template\nnot-json\n```")
+
+    assert result.template is None
+    assert result.warnings == ["team template JSON is invalid"]
+
+
+def test_loader_and_assembler_propagate_team_template_to_skill_context(tmp_path) -> None:
+    skill_dir = tmp_path / "plugin-skills" / "financial-comparison"
+    skill_dir.mkdir(parents=True)
+    (skill_dir / "SKILL.md").write_text(
+        "---\n"
+        "description: Compare financial disclosures.\n"
+        "---\n\n"
+        "# Financial Comparison\n\n"
+        "```beaver-team-template\n"
+        '{"version": 1, "nodes": [{"node_id": "collect", "task": "Collect official sources"}]}\n'
+        "```\n",
+        encoding="utf-8",
+    )
+    loader = SkillsLoader(
+        tmp_path,
+        builtin_skills_dir=tmp_path / "no-builtins",
+        extra_dirs=[tmp_path / "plugin-skills"],
+    )
+
+    record = loader.get_skill_record("financial-comparison")
+    context = SkillAssembler(loader)._activate_skill_contexts(["financial-comparison"])[0]
+
+    assert record is not None
+    assert record.team_template == {
+        "version": 1,
+        "nodes": [{"node_id": "collect", "task": "Collect official sources"}],
+    }
+    assert record.team_template_warnings == []
+    assert context.team_template == record.team_template
+    assert context.team_template_warnings == []