Merge branch 'perf/lag': dashboard lag fixes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

# Conflicts:
#	client/src/components/Sagi/PetSprite.tsx
#	client/src/components/Sagi/useSagiBrain.ts

docs/SERVER-MODE.md

@@ -797,7 +797,9 @@ What a new machine still needs by hand after it:
    `PostToolUse` (both with `"matcher": "*"`), `Stop`, `SubagentStop`,
    `Notification`, `SessionStart`, `SessionEnd` and `UserPromptSubmit`, a
    `command` hook `/opt/agenthub/libexec/member-hook <Event>` with
-   `"timeout": 5`.
+   `"timeout": 5` — and `"async": true` on `PreToolUse` and `PostToolUse`, so
+   Claude Code does not wait a Node start before and after every tool call.
+   Re-running `install-system` rewrites a managed file it wrote itself.
 5. Any other daemon that must see every process (monitoring agents, for
    example) needs group `agenthub-proc`: `sudo usermod -aG agenthub-proc <it>`.
 6. A tool `agenthub server tools` reports as `ESHAREDLAYOUT` (a script in a