fix(tests): align skill/setup and platform mocks with current behavior (#3721)

- Skill invocation: no secret capture callback so SSH remote setup note is emitted
- Patch agent.skill_utils.sys for platform checks (skill_matches_platform)
- Skip CLAUDE.md priority test on Darwin (case-insensitive FS)

Made-with: Cursor

Co-authored-by: kshitijk4poor <82637225+kshitijk4poor@users.noreply.github.com>

tests/agent/test_prompt_builder.py

@@ -5,6 +5,8 @@ import importlib
 import logging
 import sys
 
+import pytest
+
 from agent.prompt_builder import (
     _scan_context_content,
     _truncate_content,
@@ -194,7 +196,7 @@ class TestParseSkillFile:
         )
         from unittest.mock import patch
 
-        with patch("tools.skills_tool.sys") as mock_sys:
+        with patch("agent.skill_utils.sys") as mock_sys:
             mock_sys.platform = "linux"
             is_compat, _, _ = _parse_skill_file(skill_file)
         assert is_compat is False
@@ -234,9 +236,6 @@ class TestPromptBuilderImports:
 # =========================================================================
 
 
-import pytest
-
-
 class TestBuildSkillsSystemPrompt:
     @pytest.fixture(autouse=True)
     def _clear_skills_cache(self):
@@ -296,7 +295,7 @@ class TestBuildSkillsSystemPrompt:
 
         from unittest.mock import patch
 
-        with patch("tools.skills_tool.sys") as mock_sys:
+        with patch("agent.skill_utils.sys") as mock_sys:
             mock_sys.platform = "linux"
             result = build_skills_system_prompt()
 
@@ -574,6 +573,10 @@ class TestBuildContextFilesPrompt:
         result = build_context_files_prompt(cwd=str(tmp_path))
         assert "Lowercase claude rules" in result
 
+    @pytest.mark.skipif(
+        sys.platform == "darwin",
+        reason="APFS default volume is case-insensitive; CLAUDE.md and claude.md alias the same path",
+    )
     def test_claude_md_uppercase_takes_priority(self, tmp_path):
         (tmp_path / "CLAUDE.md").write_text("From uppercase.")
         (tmp_path / "claude.md").write_text("From lowercase.")

tests/agent/test_skill_commands.py

@@ -246,20 +246,10 @@ Generate some audio.
     def test_preserves_remaining_remote_setup_warning(self, tmp_path, monkeypatch):
         monkeypatch.setenv("TERMINAL_ENV", "ssh")
         monkeypatch.delenv("TENOR_API_KEY", raising=False)
-
-        def fake_secret_callback(var_name, prompt, metadata=None):
-            os.environ[var_name] = "stored-in-test"
-            return {
-                "success": True,
-                "stored_as": var_name,
-                "validated": False,
-                "skipped": False,
-            }
-
         monkeypatch.setattr(
             skills_tool_module,
             "_secret_capture_callback",
-            fake_secret_callback,
+            None,
             raising=False,
         )