docs: sync stale /background references with the /bg + /btw split

74a95a3ddf promoted /bg and /btw to independent canonical commands and
retired /background entirely (hermes_cli/commands.py's COMMAND_REGISTRY
has no "background" command or alias). Three places still taught the
old name:

- skills/autonomous-ai-agents/hermes-agent/references/slash-commands.md:
  the bundled hermes-agent skill's own slash-command reference — the
  skill's SKILL.md explicitly routes the model here for in-session
  command questions, so a model following it would emit the dead
  `/background <prompt>` and never learn /btw exists.
- ui-tui/README.md: listed /btw as an alias of /background, which is
  simply wrong post-split (both are independent, alias-free commands).
- tests/cli/test_cli_background_status_indicator.py: docstring/comments
  described the ▶ indicator by the retired command name.

No behavior change; corrects documentation only.

skills/autonomous-ai-agents/hermes-agent/references/slash-commands.md

@@ -18,7 +18,8 @@ it. New commands land often; `/help` in-session is always authoritative.
 /rollback [N]            List/restore filesystem checkpoints
 /diff [mode] [--stat]    Git changes in cwd (staged|all|session modes)
 /snapshot [sub]          Create/restore Hermes config+state snapshots (CLI)
-/background (/bg) <p>    Run prompt in background
+/bg <prompt>              Run a prompt in a separate background session
+/btw <question>           Ask a side question about the current conversation without interrupting it
 /queue (/q) <prompt>     Queue prompt for next turn
 /steer <prompt>          Inject a message after the next tool call
 /agents (/tasks)         Show active agents and running tasks

tests/cli/test_cli_background_status_indicator.py

@@ -1,7 +1,7 @@
-"""Tests for the /background indicator in the CLI status bar.
+"""Tests for the /bg indicator in the CLI status bar.
 
 The classic prompt_toolkit status bar shows `▶ N` when N tasks launched via
-`/background` are still running. Source of truth is `self._background_tasks`
+`/bg` are still running. Source of truth is `self._background_tasks`
 (a Dict[str, threading.Thread]); entries are removed in the task thread's
 finally block, so len() reflects truly-running tasks.
 """
@@ -69,7 +69,7 @@ def test_fragments_omit_bg_segment_when_idle():
 # ── Background terminal-process indicator (⚙ N) ───────────────────────────
 # Source of truth is tools.process_registry.process_registry._running (a dict
 # of currently-running shell processes spawned by terminal(background=true)).
-# Distinct from /background tasks above: ▶ counts agent threads, ⚙ counts
+# Distinct from /bg tasks above: ▶ counts agent threads, ⚙ counts
 # shell processes. Both can be active simultaneously.
 
 
@@ -105,7 +105,7 @@ def _patch_process_registry(monkeypatch, count: int) -> None:
 # ── Background/async subagent indicator (⛓ N) ─────────────────────────────
 # Source of truth is tools.async_delegation.active_count() — the count of
 # delegate_task delegations (batch + background single) still in the
-# "running" state. Distinct from ▶ (/background agent threads) and ⚙ (shell
+# "running" state. Distinct from ▶ (/bg agent threads) and ⚙ (shell
 # processes); all three can be active at once.
 
 

ui-tui/README.md

@@ -235,7 +235,7 @@ The following commands are handled directly by the TUI client. Unrecognized comm
 
 ### Session (`session.ts`)
 `/model`, `/sessions` (aliases `/switch`, `/session`, `/resume`),
-`/background` (aliases `/bg`, `/btw`), `/image`, `/personality`,
+`/bg`, `/btw`, `/image`, `/personality`,
 `/compress`, `/branch` (alias `/fork`), `/voice`, `/skin`,
 `/indicator`, `/yolo`, `/reasoning`, `/fast`, `/busy`, `/verbose`, `/usage`