test: add unit tests for 5 security/logic-critical modules (batch 4)

- gateway/pairing.py: rate limiting, lockout, code expiry, approval flow (28 tests)
- tools/skill_manager_tool.py: validation, path traversal prevention, CRUD (46 tests)
- tools/skills_tool.py: frontmatter/tag parsing, skill discovery, view chain (34 tests)
- agent/auxiliary_client.py: auth reading, API key resolution, param branching (16 tests)
- honcho_integration/session.py: session dataclass, ID sanitization, transcript format (20 tests)

tests/honcho_integration/test_session.py

@@ -0,0 +1,189 @@
+"""Tests for honcho_integration/session.py — HonchoSession and helpers."""
+
+from datetime import datetime
+from unittest.mock import MagicMock
+
+from honcho_integration.session import (
+    HonchoSession,
+    HonchoSessionManager,
+)
+
+
+# ---------------------------------------------------------------------------
+# HonchoSession dataclass
+# ---------------------------------------------------------------------------
+
+
+class TestHonchoSession:
+    def _make_session(self):
+        return HonchoSession(
+            key="telegram:12345",
+            user_peer_id="user-telegram-12345",
+            assistant_peer_id="hermes-assistant",
+            honcho_session_id="telegram-12345",
+        )
+
+    def test_initial_state(self):
+        session = self._make_session()
+        assert session.key == "telegram:12345"
+        assert session.messages == []
+        assert isinstance(session.created_at, datetime)
+        assert isinstance(session.updated_at, datetime)
+
+    def test_add_message(self):
+        session = self._make_session()
+        session.add_message("user", "Hello!")
+        assert len(session.messages) == 1
+        assert session.messages[0]["role"] == "user"
+        assert session.messages[0]["content"] == "Hello!"
+        assert "timestamp" in session.messages[0]
+
+    def test_add_message_with_kwargs(self):
+        session = self._make_session()
+        session.add_message("assistant", "Hi!", source="gateway")
+        assert session.messages[0]["source"] == "gateway"
+
+    def test_add_message_updates_timestamp(self):
+        session = self._make_session()
+        original = session.updated_at
+        session.add_message("user", "test")
+        assert session.updated_at >= original
+
+    def test_get_history(self):
+        session = self._make_session()
+        session.add_message("user", "msg1")
+        session.add_message("assistant", "msg2")
+        history = session.get_history()
+        assert len(history) == 2
+        assert history[0] == {"role": "user", "content": "msg1"}
+        assert history[1] == {"role": "assistant", "content": "msg2"}
+
+    def test_get_history_strips_extra_fields(self):
+        session = self._make_session()
+        session.add_message("user", "hello", extra="metadata")
+        history = session.get_history()
+        assert "extra" not in history[0]
+        assert set(history[0].keys()) == {"role", "content"}
+
+    def test_get_history_max_messages(self):
+        session = self._make_session()
+        for i in range(10):
+            session.add_message("user", f"msg{i}")
+        history = session.get_history(max_messages=3)
+        assert len(history) == 3
+        assert history[0]["content"] == "msg7"
+        assert history[2]["content"] == "msg9"
+
+    def test_get_history_max_messages_larger_than_total(self):
+        session = self._make_session()
+        session.add_message("user", "only one")
+        history = session.get_history(max_messages=100)
+        assert len(history) == 1
+
+    def test_clear(self):
+        session = self._make_session()
+        session.add_message("user", "msg1")
+        session.add_message("user", "msg2")
+        session.clear()
+        assert session.messages == []
+
+    def test_clear_updates_timestamp(self):
+        session = self._make_session()
+        session.add_message("user", "msg")
+        original = session.updated_at
+        session.clear()
+        assert session.updated_at >= original
+
+
+# ---------------------------------------------------------------------------
+# HonchoSessionManager._sanitize_id
+# ---------------------------------------------------------------------------
+
+
+class TestSanitizeId:
+    def test_clean_id_unchanged(self):
+        mgr = HonchoSessionManager()
+        assert mgr._sanitize_id("telegram-12345") == "telegram-12345"
+
+    def test_colons_replaced(self):
+        mgr = HonchoSessionManager()
+        assert mgr._sanitize_id("telegram:12345") == "telegram-12345"
+
+    def test_special_chars_replaced(self):
+        mgr = HonchoSessionManager()
+        result = mgr._sanitize_id("user@chat#room!")
+        assert "@" not in result
+        assert "#" not in result
+        assert "!" not in result
+
+    def test_alphanumeric_preserved(self):
+        mgr = HonchoSessionManager()
+        assert mgr._sanitize_id("abc123_XYZ-789") == "abc123_XYZ-789"
+
+
+# ---------------------------------------------------------------------------
+# HonchoSessionManager._format_migration_transcript
+# ---------------------------------------------------------------------------
+
+
+class TestFormatMigrationTranscript:
+    def test_basic_transcript(self):
+        messages = [
+            {"role": "user", "content": "Hello", "timestamp": "2026-01-01T00:00:00"},
+            {"role": "assistant", "content": "Hi!", "timestamp": "2026-01-01T00:01:00"},
+        ]
+        result = HonchoSessionManager._format_migration_transcript("telegram:123", messages)
+        assert isinstance(result, bytes)
+        text = result.decode("utf-8")
+        assert "<prior_conversation_history>" in text
+        assert "user: Hello" in text
+        assert "assistant: Hi!" in text
+        assert 'session_key="telegram:123"' in text
+        assert 'message_count="2"' in text
+
+    def test_empty_messages(self):
+        result = HonchoSessionManager._format_migration_transcript("key", [])
+        text = result.decode("utf-8")
+        assert "<prior_conversation_history>" in text
+        assert "</prior_conversation_history>" in text
+
+    def test_missing_fields_handled(self):
+        messages = [{"role": "user"}]  # no content, no timestamp
+        result = HonchoSessionManager._format_migration_transcript("key", messages)
+        text = result.decode("utf-8")
+        assert "user: " in text  # empty content
+
+
+# ---------------------------------------------------------------------------
+# HonchoSessionManager.delete / list_sessions
+# ---------------------------------------------------------------------------
+
+
+class TestManagerCacheOps:
+    def test_delete_cached_session(self):
+        mgr = HonchoSessionManager()
+        session = HonchoSession(
+            key="test", user_peer_id="u", assistant_peer_id="a",
+            honcho_session_id="s",
+        )
+        mgr._cache["test"] = session
+        assert mgr.delete("test") is True
+        assert "test" not in mgr._cache
+
+    def test_delete_nonexistent_returns_false(self):
+        mgr = HonchoSessionManager()
+        assert mgr.delete("nonexistent") is False
+
+    def test_list_sessions(self):
+        mgr = HonchoSessionManager()
+        s1 = HonchoSession(key="k1", user_peer_id="u", assistant_peer_id="a", honcho_session_id="s1")
+        s2 = HonchoSession(key="k2", user_peer_id="u", assistant_peer_id="a", honcho_session_id="s2")
+        s1.add_message("user", "hi")
+        mgr._cache["k1"] = s1
+        mgr._cache["k2"] = s2
+        sessions = mgr.list_sessions()
+        assert len(sessions) == 2
+        keys = {s["key"] for s in sessions}
+        assert keys == {"k1", "k2"}
+        s1_info = next(s for s in sessions if s["key"] == "k1")
+        assert s1_info["message_count"] == 1