docs: sentence-case sweep across 10 more pages

- tools/plugin: Package Entrypoints
- tools/code-execution: How To Use It
- tools/browser-linux-troubleshooting: Root Cause, Config Reference
- install/bun: Lifecycle Scripts
- nodes/audio: Mention Detection in Groups
- nodes/images: Inbound Media to Commands (Pi)
- platforms/android: Connection Runbook
- plugins/building-plugins: Beta Release Testing
- web/control-ui: Content Security Policy
- security/THREAT-MODEL-ATLAS: Framework Attribution

docs/nodes/audio.md

@@ -175,7 +175,7 @@ Provider-based audio transcription honors standard outbound proxy env vars:
 
 If no proxy env vars are set, direct egress is used. If proxy config is malformed, OpenClaw logs a warning and falls back to direct fetch.
 
-## Mention Detection in Groups
+## Mention detection in groups
 
 When `requireMention: true` is set for a group chat, OpenClaw now transcribes audio **before** checking for mentions. This allows voice notes to be processed even when they contain mentions.
 

docs/nodes/images.md

@@ -39,7 +39,7 @@ The WhatsApp channel runs via **Baileys Web**. This document captures the curren
 - When media is present, the web sender resolves local paths or URLs using the same pipeline as `openclaw message send`.
 - Multiple media entries are sent sequentially if provided.
 
-## Inbound Media to Commands (Pi)
+## Inbound media to commands (Pi)
 
 - When inbound web messages include media, OpenClaw downloads to a temp file and exposes templating variables:
   - `{{MediaUrl}}` pseudo-URL for the inbound media.