docs: add communication style skill and enable it globally

Adds a new communication-style skill for rewriting text in a more human voice
Replaces the old unslop skill with the new name and guidance
Updates agent instructions to apply the communication-style skill to every task

.agents/skills/communication-style/SKILL.md

@@ -1,10 +1,10 @@
 ---
-name: unslop
-description: Must always apply.
+name: communication-style
+description: Use it always.
 author: poteto (pstack)
 ---
 
-# Unslop
+# Communication style
 
 Edit text to remove AI patterns and add human voice.
 

AGENTS.md

@@ -95,6 +95,7 @@ process violation.
 | iOS Simulator build, launch, preview, gestures, or `serve-sim` control | `serve-sim` |
 | Drafting or updating user-facing CHANGELOG entries for the `[Unreleased]` section (main app or VS Code extension) | `changelog-authoring` |
 | Creating or editing skills, `AGENTS.md`, or docs reached through agent instructions/context pointers | `writing-for-agents` |
+| Every task, always | `communication-style` |
 
 Pure code-reading or explanation does not require implementation skills unless needed to interpret a specialized subsystem.