feat: preload CLI skills on launch (#1359)

* feat: preload CLI skills on launch

* test: cover continue with worktree and skills flags

* feat: show activated skills before CLI banner

tests/agent/test_skill_commands.py

@@ -4,7 +4,11 @@ import os
 from unittest.mock import patch
 
 import tools.skills_tool as skills_tool_module
-from agent.skill_commands import scan_skill_commands, build_skill_invocation_message
+from agent.skill_commands import (
+    scan_skill_commands,
+    build_skill_invocation_message,
+    build_preloaded_skills_prompt,
+)
 
 
 def _make_skill(
@@ -79,6 +83,33 @@ class TestScanSkillCommands:
         assert "/generic-tool" in result
 
 
+class TestBuildPreloadedSkillsPrompt:
+    def test_builds_prompt_for_multiple_named_skills(self, tmp_path):
+        with patch("tools.skills_tool.SKILLS_DIR", tmp_path):
+            _make_skill(tmp_path, "first-skill")
+            _make_skill(tmp_path, "second-skill")
+            prompt, loaded, missing = build_preloaded_skills_prompt(
+                ["first-skill", "second-skill"]
+            )
+
+        assert missing == []
+        assert loaded == ["first-skill", "second-skill"]
+        assert "first-skill" in prompt
+        assert "second-skill" in prompt
+        assert "preloaded" in prompt.lower()
+
+    def test_reports_missing_named_skills(self, tmp_path):
+        with patch("tools.skills_tool.SKILLS_DIR", tmp_path):
+            _make_skill(tmp_path, "present-skill")
+            prompt, loaded, missing = build_preloaded_skills_prompt(
+                ["present-skill", "missing-skill"]
+            )
+
+        assert "present-skill" in prompt
+        assert loaded == ["present-skill"]
+        assert missing == ["missing-skill"]
+
+
 class TestBuildSkillInvocationMessage:
     def test_loads_skill_by_stored_path_when_frontmatter_name_differs(self, tmp_path):
         skill_dir = tmp_path / "mlops" / "audiocraft"