feat(honcho): context injection overhaul, 5-tool surface, cost safety, session isolation (#10619)

Salvaged from PR #9884 by erosika. Cherry-picked plugin changes onto
current main with minimal core modifications.

Plugin changes (plugins/memory/honcho/):
- New honcho_reasoning tool (5th tool, splits LLM calls from honcho_context)
- Two-layer context injection: base context (summary + representation + card)
  on contextCadence, dialectic supplement on dialecticCadence
- Multi-pass dialectic depth (1-3 passes) with early bail-out on strong signal
- Cold/warm prompt selection based on session state
- dialecticCadence defaults to 3 (was 1) — ~66% fewer Honcho LLM calls
- Session summary injection for conversational continuity
- Bidirectional peer targeting on all 5 tools
- Correctness fixes: peer param fallback, None guard on set_peer_card,
  schema validation, signal_sufficient anchored regex, mid->medium level fix

Core changes (~20 lines across 3 files):
- agent/memory_manager.py: Enhanced sanitize_context() to strip full
  <memory-context> blocks and system notes (prevents leak from saveMessages)
- run_agent.py: gateway_session_key param for stable per-chat Honcho sessions,
  on_turn_start() call before prefetch_all() for cadence tracking,
  sanitize_context() on user messages to strip leaked memory blocks
- gateway/run.py: skip_memory=True on 2 temp agents (prevents orphan sessions),
  gateway_session_key threading to main agent

Tests: 509 passed (3 skipped — honcho SDK not installed locally)
Docs: Updated honcho.md, memory-providers.md, tools-reference.md, SKILL.md

Co-authored-by: erosika <erosika@users.noreply.github.com>

tests/honcho_plugin/test_cli.py

@@ -0,0 +1,56 @@
+"""Tests for plugins/memory/honcho/cli.py."""
+
+from types import SimpleNamespace
+
+
+class TestCmdStatus:
+    def test_reports_connection_failure_when_session_setup_fails(self, monkeypatch, capsys, tmp_path):
+        import plugins.memory.honcho.cli as honcho_cli
+
+        cfg_path = tmp_path / "honcho.json"
+        cfg_path.write_text("{}")
+
+        class FakeConfig:
+            enabled = True
+            api_key = "root-key"
+            workspace_id = "hermes"
+            host = "hermes"
+            base_url = None
+            ai_peer = "hermes"
+            peer_name = "eri"
+            recall_mode = "hybrid"
+            user_observe_me = True
+            user_observe_others = False
+            ai_observe_me = False
+            ai_observe_others = True
+            write_frequency = "async"
+            session_strategy = "per-session"
+            context_tokens = 800
+
+            def resolve_session_name(self):
+                return "hermes"
+
+        monkeypatch.setattr(honcho_cli, "_read_config", lambda: {"apiKey": "***"})
+        monkeypatch.setattr(honcho_cli, "_config_path", lambda: cfg_path)
+        monkeypatch.setattr(honcho_cli, "_local_config_path", lambda: cfg_path)
+        monkeypatch.setattr(honcho_cli, "_active_profile_name", lambda: "default")
+        monkeypatch.setattr(
+            "plugins.memory.honcho.client.HonchoClientConfig.from_global_config",
+            lambda host=None: FakeConfig(),
+        )
+        monkeypatch.setattr(
+            "plugins.memory.honcho.client.get_honcho_client",
+            lambda cfg: object(),
+        )
+
+        def _boom(hcfg, client):
+            raise RuntimeError("Invalid API key")
+
+        monkeypatch.setattr(honcho_cli, "_show_peer_cards", _boom)
+        monkeypatch.setitem(__import__("sys").modules, "honcho", SimpleNamespace())
+
+        honcho_cli.cmd_status(SimpleNamespace(all=False))
+
+        out = capsys.readouterr().out
+        assert "FAILED (Invalid API key)" in out
+        assert "Connection... OK" not in out