test: add unit tests for 8 modules (batch 2)

Cover model_tools, toolset_distributions, context_compressor,
prompt_caching, cronjob_tools, session_search, process_registry,
and cron/scheduler with 127 new test cases.

tests/cron/test_scheduler.py

@@ -0,0 +1,36 @@
+"""Tests for cron/scheduler.py — origin resolution and delivery routing."""
+
+import pytest
+
+from cron.scheduler import _resolve_origin
+
+
+class TestResolveOrigin:
+    def test_full_origin(self):
+        job = {
+            "origin": {
+                "platform": "telegram",
+                "chat_id": "123456",
+                "chat_name": "Test Chat",
+            }
+        }
+        result = _resolve_origin(job)
+        assert result is not None
+        assert result["platform"] == "telegram"
+        assert result["chat_id"] == "123456"
+
+    def test_no_origin(self):
+        assert _resolve_origin({}) is None
+        assert _resolve_origin({"origin": None}) is None
+
+    def test_missing_platform(self):
+        job = {"origin": {"chat_id": "123"}}
+        assert _resolve_origin(job) is None
+
+    def test_missing_chat_id(self):
+        job = {"origin": {"platform": "telegram"}}
+        assert _resolve_origin(job) is None
+
+    def test_empty_origin(self):
+        job = {"origin": {}}
+        assert _resolve_origin(job) is None