feat(honcho): async memory integration with prefetch pipeline and recallMode

Adds full Honcho memory integration to Hermes:

- Session manager with async background writes, memory modes (honcho/hybrid/local),
  and dialectic prefetch for first-turn context warming
- Agent integration: prefetch pipeline, tool surface gated by recallMode,
  system prompt context injection, SIGTERM/SIGINT flush handlers
- CLI commands: setup, status, mode, tokens, peer, identity, migrate
- recallMode setting (auto | context | tools) for A/B testing retrieval strategies
- Session strategies: per-session, per-repo (git tree root), per-directory, global
- Polymorphic memoryMode config: string shorthand or per-peer object overrides
- 97 tests covering async writes, client config, session resolution, and memory modes

website/docs/user-guide/messaging/slack.md

@@ -91,6 +91,7 @@ You can always find or regenerate app-level tokens under **Settings → Basic In
 
 This step is critical — it controls what messages the bot can see.
 
+
 1. In the sidebar, go to **Features → Event Subscriptions**
 2. Toggle **Enable Events** to ON
 3. Expand **Subscribe to bot events** and add:
@@ -110,6 +111,7 @@ If the bot works in DMs but **not in channels**, you almost certainly forgot to
 Without these events, Slack simply never delivers channel messages to the bot.
 :::
 
+
 ---
 
 ## Step 5: Install App to Workspace
@@ -200,6 +202,7 @@ This is intentional — it prevents the bot from responding to every message in
 
 ---
 
+
 ## Home Channel
 
 Set `SLACK_HOME_CHANNEL` to a channel ID where Hermes will deliver scheduled messages,