test: add unit tests for 8 untested modules

Add comprehensive test coverage for:
- cron/jobs.py: schedule parsing, job CRUD, due-job detection (34 tests)
- tools/memory_tool.py: security scanning, MemoryStore ops, dispatcher (32 tests)
- toolsets.py: resolution, validation, composition, cycle detection (19 tests)
- tools/file_operations.py: write deny list, result dataclasses, helpers (37 tests)
- agent/prompt_builder.py: context scanning, truncation, skills index (24 tests)
- agent/model_metadata.py: token estimation, context lengths (16 tests)
- hermes_state.py: SessionDB SQLite CRUD, FTS5 search, export, prune (28 tests)

Total: 210 new tests, all passing (380 total suite).

tests/test_toolsets.py

@@ -0,0 +1,143 @@
+"""Tests for toolsets.py — toolset resolution, validation, and composition."""
+
+import pytest
+
+from toolsets import (
+    TOOLSETS,
+    get_toolset,
+    resolve_toolset,
+    resolve_multiple_toolsets,
+    get_all_toolsets,
+    get_toolset_names,
+    validate_toolset,
+    create_custom_toolset,
+    get_toolset_info,
+)
+
+
+class TestGetToolset:
+    def test_known_toolset(self):
+        ts = get_toolset("web")
+        assert ts is not None
+        assert "web_search" in ts["tools"]
+
+    def test_unknown_returns_none(self):
+        assert get_toolset("nonexistent") is None
+
+
+class TestResolveToolset:
+    def test_leaf_toolset(self):
+        tools = resolve_toolset("web")
+        assert set(tools) == {"web_search", "web_extract"}
+
+    def test_composite_toolset(self):
+        tools = resolve_toolset("debugging")
+        assert "terminal" in tools
+        assert "web_search" in tools
+        assert "web_extract" in tools
+
+    def test_cycle_detection(self):
+        # Create a cycle: A includes B, B includes A
+        TOOLSETS["_cycle_a"] = {"description": "test", "tools": ["t1"], "includes": ["_cycle_b"]}
+        TOOLSETS["_cycle_b"] = {"description": "test", "tools": ["t2"], "includes": ["_cycle_a"]}
+        try:
+            tools = resolve_toolset("_cycle_a")
+            # Should not infinite loop — cycle is detected
+            assert "t1" in tools
+            assert "t2" in tools
+        finally:
+            del TOOLSETS["_cycle_a"]
+            del TOOLSETS["_cycle_b"]
+
+    def test_unknown_toolset_returns_empty(self):
+        assert resolve_toolset("nonexistent") == []
+
+    def test_all_alias(self):
+        tools = resolve_toolset("all")
+        assert len(tools) > 10  # Should resolve all tools from all toolsets
+
+    def test_star_alias(self):
+        tools = resolve_toolset("*")
+        assert len(tools) > 10
+
+
+class TestResolveMultipleToolsets:
+    def test_combines_and_deduplicates(self):
+        tools = resolve_multiple_toolsets(["web", "terminal"])
+        assert "web_search" in tools
+        assert "web_extract" in tools
+        assert "terminal" in tools
+        # No duplicates
+        assert len(tools) == len(set(tools))
+
+    def test_empty_list(self):
+        assert resolve_multiple_toolsets([]) == []
+
+
+class TestValidateToolset:
+    def test_valid(self):
+        assert validate_toolset("web") is True
+        assert validate_toolset("terminal") is True
+
+    def test_all_alias_valid(self):
+        assert validate_toolset("all") is True
+        assert validate_toolset("*") is True
+
+    def test_invalid(self):
+        assert validate_toolset("nonexistent") is False
+
+
+class TestGetToolsetInfo:
+    def test_leaf(self):
+        info = get_toolset_info("web")
+        assert info["name"] == "web"
+        assert info["is_composite"] is False
+        assert info["tool_count"] == 2
+
+    def test_composite(self):
+        info = get_toolset_info("debugging")
+        assert info["is_composite"] is True
+        assert info["tool_count"] > len(info["direct_tools"])
+
+    def test_unknown_returns_none(self):
+        assert get_toolset_info("nonexistent") is None
+
+
+class TestCreateCustomToolset:
+    def test_runtime_creation(self):
+        create_custom_toolset(
+            name="_test_custom",
+            description="Test toolset",
+            tools=["web_search"],
+            includes=["terminal"],
+        )
+        try:
+            tools = resolve_toolset("_test_custom")
+            assert "web_search" in tools
+            assert "terminal" in tools
+            assert validate_toolset("_test_custom") is True
+        finally:
+            del TOOLSETS["_test_custom"]
+
+
+class TestToolsetConsistency:
+    """Verify structural integrity of the built-in TOOLSETS dict."""
+
+    def test_all_toolsets_have_required_keys(self):
+        for name, ts in TOOLSETS.items():
+            assert "description" in ts, f"{name} missing description"
+            assert "tools" in ts, f"{name} missing tools"
+            assert "includes" in ts, f"{name} missing includes"
+
+    def test_all_includes_reference_existing_toolsets(self):
+        for name, ts in TOOLSETS.items():
+            for inc in ts["includes"]:
+                assert inc in TOOLSETS, f"{name} includes unknown toolset '{inc}'"
+
+    def test_hermes_platforms_share_core_tools(self):
+        """All hermes-* platform toolsets should have the same tools."""
+        platforms = ["hermes-cli", "hermes-telegram", "hermes-discord", "hermes-whatsapp", "hermes-slack"]
+        tool_sets = [set(TOOLSETS[p]["tools"]) for p in platforms]
+        # All platform toolsets should be identical
+        for ts in tool_sets[1:]:
+            assert ts == tool_sets[0]