docs: fill documentation gaps from recent PRs (#2183)

- slash-commands.md: add /approve, /deny (gateway-only), /statusbar
  (CLI-only); update Notes section with new platform-specific commands
- messaging/index.md: add Webhooks to architecture diagram, platform
  toolsets table, and Next Steps links; add /approve and /deny to
  Chat Commands table
- environment-variables.md: add HONCHO_BASE_URL for self-hosted
  Honcho instances
- configuration.md: add Context Pressure Warnings section (separate
  from iteration budget pressure); add base_url to OpenAI TTS config;
  add display.show_cost to Display Settings
- tts.md: add base_url to OpenAI TTS config example

Co-authored-by: Test <test@test.com>

website/docs/user-guide/configuration.md

@@ -854,6 +854,31 @@ agent:
 
 Budget pressure is enabled by default. The agent sees warnings naturally as part of tool results, encouraging it to consolidate its work and deliver a response before running out of iterations.
 
+## Context Pressure Warnings
+
+Separate from iteration budget pressure, context pressure tracks how close the conversation is to the **compaction threshold** — the point where context compression fires to summarize older messages. This helps both you and the agent understand when the conversation is getting long.
+
+| Progress | Level | What happens |
+|----------|-------|-------------|
+| **≥ 60%** to threshold | Info | CLI shows a cyan progress bar; gateway sends an informational notice |
+| **≥ 85%** to threshold | Warning | CLI shows a bold yellow bar; gateway warns compaction is imminent |
+
+In the CLI, context pressure appears as a progress bar in the tool output feed:
+
+```
+  ◐ context ████████████░░░░░░░░ 62% to compaction  48k threshold (50%) · approaching compaction
+```
+
+On messaging platforms, a plain-text notification is sent:
+
+```
+◐ Context: ████████████░░░░░░░░ 62% to compaction (threshold: 50% of window).
+```
+
+If auto-compression is disabled, the warning tells you context may be truncated instead.
+
+Context pressure is automatic — no configuration needed. It fires purely as a user-facing notification and does not modify the message stream or inject anything into the model's context.
+
 ## Auxiliary Models
 
 Hermes uses lightweight "auxiliary" models for side tasks like image analysis, web page summarization, and browser screenshot analysis. By default, these use **Gemini Flash** via auto-detection — you don't need to configure anything.
@@ -1042,6 +1067,7 @@ tts:
   openai:
     model: "gpt-4o-mini-tts"
     voice: "alloy"              # alloy, echo, fable, onyx, nova, shimmer
+    base_url: "https://api.openai.com/v1"  # Override for OpenAI-compatible TTS endpoints
   neutts:
     ref_audio: ''
     ref_text: ''
@@ -1065,6 +1091,7 @@ display:
   show_reasoning: false   # Show model reasoning/thinking above each response (toggle with /reasoning show|hide)
   streaming: false        # Stream tokens to terminal as they arrive (real-time output)
   background_process_notifications: all  # all | result | error | off (gateway only)
+  show_cost: false        # Show estimated $ cost in the CLI status bar
 ```
 
 ### Theme mode

website/docs/user-guide/features/tts.md

@@ -42,6 +42,7 @@ tts:
   openai:
     model: "gpt-4o-mini-tts"
     voice: "alloy"              # alloy, echo, fable, onyx, nova, shimmer
+    base_url: "https://api.openai.com/v1"  # Override for OpenAI-compatible TTS endpoints
   neutts:
     ref_audio: ''
     ref_text: ''

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

@@ -1,7 +1,7 @@
 ---
 sidebar_position: 1
 title: "Messaging Gateway"
-description: "Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, Mattermost, Matrix, DingTalk, or any OpenAI-compatible frontend via the API server — architecture and setup overview"
+description: "Chat with Hermes from Telegram, Discord, Slack, WhatsApp, Signal, SMS, Email, Home Assistant, Mattermost, Matrix, DingTalk, Webhooks, or any OpenAI-compatible frontend via the API server — architecture and setup overview"
 ---
 
 # Messaging Gateway
@@ -28,6 +28,7 @@ flowchart TB
             mx[Matrix]
             dt[DingTalk]
             api["API Server<br/>(OpenAI-compatible)"]
+            wh[Webhooks]
         end
 
         store["Session store<br/>per chat"]
@@ -47,6 +48,7 @@ flowchart TB
     mx --> store
     dt --> store
     api --> store
+    wh --> store
     store --> agent
     cron --> store
 ```
@@ -88,6 +90,8 @@ hermes gateway status --system         # Linux only: inspect the system service
 | `/undo` | Remove the last exchange |
 | `/status` | Show session info |
 | `/stop` | Stop the running agent |
+| `/approve` | Approve a pending dangerous command |
+| `/deny` | Reject a pending dangerous command |
 | `/sethome` | Set this chat as the home channel |
 | `/compress` | Manually compress conversation context |
 | `/title [name]` | Set or show the session title |
@@ -309,6 +313,7 @@ Each platform has its own toolset:
 | Matrix | `hermes-matrix` | Full tools including terminal |
 | DingTalk | `hermes-dingtalk` | Full tools including terminal |
 | API Server | `hermes` (default) | Full tools including terminal |
+| Webhooks | `hermes-webhook` | Full tools including terminal |
 
 ## Next Steps
 
@@ -324,3 +329,4 @@ Each platform has its own toolset:
 - [Matrix Setup](matrix.md)
 - [DingTalk Setup](dingtalk.md)
 - [Open WebUI + API Server](open-webui.md)
+- [Webhooks](webhooks.md)