docs(config): show options in comments for display settings (#16038)

Users who run `hermes setup` get `cli-config.yaml.example` copied verbatim
(including comments) to ~/.hermes/config.yaml. But several display settings
had thin comments that didn't enumerate the valid options, so users couldn't
tell from reading their config what values each key accepts.

- busy_input_mode: widen from 'CLI' to 'CLI and gateway platforms';
  note /stop as gateway equivalent of Ctrl+C; add /busy_input_mode runtime hint
- compact, interim_assistant_messages, bell_on_complete, show_reasoning,
  streaming: add true/false option lines showing effect of each value
- skin: refresh the built-in skin list (was missing daylight, warm-lightmode,
  poseidon, sisyphus, charizard — 5 of 9 built-ins undocumented)

cli-config.yaml.example

@@ -824,7 +824,9 @@ delegation:
 # Display
 # =============================================================================
 display:
-  # Use compact banner mode
+  # Use compact banner mode (hides the ASCII-art banner, shows a single line).
+  #   true:  Compact single-line banner
+  #   false: Full ASCII banner with tool/skill summary (default)
   compact: false
 
   # Tool progress display level (CLI and gateway)
@@ -838,12 +840,15 @@ display:
   # Gateway-only natural mid-turn assistant updates.
   # When true, completed assistant status messages are sent as separate chat
   # messages. This is independent of tool_progress and gateway streaming.
+  #   true:  Send mid-turn assistant updates as separate messages (default)
+  #   false: Only send the final response
   interim_assistant_messages: true
 
-  # What Enter does when Hermes is already busy in the CLI.
+  # What Enter does when Hermes is already busy (CLI and gateway platforms).
   #   interrupt: Interrupt the current run and redirect Hermes (default)
   #   queue:     Queue your message for the next turn
-  # Ctrl+C always interrupts regardless of this setting.
+  # Ctrl+C (or /stop in gateway) always interrupts regardless of this setting.
+  # Toggle at runtime with /busy_input_mode <interrupt|queue>.
   busy_input_mode: interrupt
 
   # Background process notifications (gateway/messaging only).
@@ -859,17 +864,22 @@ display:
   # Play terminal bell when agent finishes a response.
   # Useful for long-running tasks — your terminal will ding when the agent is done.
   # Works over SSH. Most terminals can be configured to flash the taskbar or play a sound.
+  #   true:  Ring the terminal bell on each response
+  #   false: Silent (default)
   bell_on_complete: false
 
   # Show model reasoning/thinking before each response.
   # When enabled, a dim box shows the model's thought process above the response.
   # Toggle at runtime with /reasoning show or /reasoning hide.
+  #   true:  Show the reasoning box
+  #   false: Hide reasoning (default)
   show_reasoning: false
 
   # Stream tokens to the terminal as they arrive instead of waiting for the
   # full response. The response box opens on first token and text appears
   # line-by-line. Tool calls are still captured silently.
-  # Stream tokens to the terminal in real-time. Disable to wait for full responses.
+  #   true:  Stream tokens as they arrive (default)
+  #   false: Wait for the full response before rendering
   streaming: true
 
   # ───────────────────────────────────────────────────────────────────────────
@@ -879,10 +889,15 @@ display:
   # response box label, and branding text. Change at runtime with /skin <name>.
   #
   # Built-in skins:
-  #   default  — Classic Hermes gold/kawaii
-  #   ares     — Crimson/bronze war-god theme with spinner wings
-  #   mono     — Clean grayscale monochrome
-  #   slate    — Cool blue developer-focused
+  #   default        — Classic Hermes gold/kawaii
+  #   ares           — Crimson/bronze war-god theme with spinner wings
+  #   mono           — Clean grayscale monochrome
+  #   slate          — Cool blue developer-focused
+  #   daylight       — Bright light-mode theme
+  #   warm-lightmode — Warm paper-tone light-mode theme
+  #   poseidon       — Sea-green/teal Olympian theme
+  #   sisyphus       — Earthy stone-and-moss theme
+  #   charizard      — Fiery orange dragon theme
   #
   # Custom skins: drop a YAML file in ~/.hermes/skins/<name>.yaml
   # Schema (all fields optional, missing values inherit from default):