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

Context Injection Overhaul:
- Base layer: peer.context() (representation + card) cached with 5-minute TTL
- Dialectic supplement: cadence-gated, cached until next refresh
- Trivial prompt skip: short inputs/slash commands skip injection
- New peer guard: dialectic skipped at session start when peer has no context
- Targeted warm prompt for better dialectic quality

Tool Surface (5 bidirectional tools):
- honcho_profile: read or update peer card
- honcho_search: semantic search over context
- honcho_context: full session context (summary, representation, card, messages)
- honcho_reasoning: synthesized answer, reasoning_level param
- honcho_conclude: create or delete conclusions (PII removal)

Cost Safety:
- dialectic_cadence defaults to 3 (~66% fewer LLM calls)
- context_tokens defaults to uncapped (cap opt-in via config/wizard)
- on_turn_start hook wired up (fixes broken cadence/injection gating)

Correctness:
- Explicit target= on peer context/card fetches (fixes identity blur)
- honcho_search perspective fix under directional observation
- Timeout config plumbing
- peerName precedence over gateway user_id
- skip_memory on temp agents (orphan session prevention)
- gateway_session_key for stable per-chat session continuity
- initOnSessionStart for eager tools-mode init
- get_session_context fallback respects peer param
- mid -> medium in reasoning level validation

ABC changes (minimal, honcho-only):
- run_agent.py: gateway_session_key param + memory provider wiring (+5 lines)
- gateway/run.py: skip_memory on 2 temp agents, gateway_session_key on main agent (+3 lines)
- agent/memory_manager.py: sanitize regex for context tag variants (+9 lines)

run_agent.py

@@ -593,6 +593,7 @@ class AIAgent:
         prefill_messages: List[Dict[str, Any]] = None,
         platform: str = None,
         user_id: str = None,
+        gateway_session_key: str = None,
         skip_context_files: bool = False,
         skip_memory: bool = False,
         session_db=None,
@@ -658,6 +659,7 @@ class AIAgent:
         self.ephemeral_system_prompt = ephemeral_system_prompt
         self.platform = platform  # "cli", "telegram", "discord", "whatsapp", etc.
         self._user_id = user_id  # Platform user identifier (gateway sessions)
+        self._gateway_session_key = gateway_session_key  # Stable per-chat key (e.g. agent:main:telegram:dm:123)
         # Pluggable print function — CLI replaces this with _cprint so that
         # raw ANSI status lines are routed through prompt_toolkit's renderer
         # instead of going directly to stdout where patch_stdout's StdoutProxy
@@ -1206,6 +1208,9 @@ class AIAgent:
                         # Thread gateway user identity for per-user memory scoping
                         if self._user_id:
                             _init_kwargs["user_id"] = self._user_id
+                        # Thread gateway session key for stable per-chat Honcho session isolation
+                        if self._gateway_session_key:
+                            _init_kwargs["gateway_session_key"] = self._gateway_session_key
                         # Profile identity for per-profile provider scoping
                         try:
                             from hermes_cli.profiles import get_active_profile_name