Add information about the agent skills lifecycle and clarify docs-writer skill metadata.

.gemini/skills/docs-writer/SKILL.md

@@ -2,8 +2,7 @@
 name: docs-writer
 description:
   Always use this skill when the task involves writing, reviewing, or editing 
-  documentation, specifically for any files in the `/docs` directory or any 
-  `.md` files in the repository.
+  files in the `/docs` directory or any `.md` files in the repository.
 ---
 
 # `docs-writer` skill instructions

docs/cli/skills.md

@@ -89,7 +89,7 @@ gemini skills enable my-expertise
 gemini skills disable my-expertise --scope workspace
 ```
 
-## How it Works (Security & Privacy)
+## How it Works
 
 1.  **Discovery**: At the start of a session, Gemini CLI scans the discovery
     tiers and injects the name and description of all enabled skills into the
@@ -106,6 +106,13 @@ gemini skills disable my-expertise --scope workspace
 5.  **Execution**: The model proceeds with the specialized expertise active. It
     is instructed to prioritize the skill's procedural guidance within reason.
 
+### Skill activation
+
+Once a skill is activated (typically by Gemini identifying a task that matches
+the skill's description and your approval), its specialized instructions and
+resources are loaded into the agent's context. A skill remains active and its
+guidance is prioritized for the duration of the session.
+
 ## Creating your own skills
 
 To create your own skills, see the [Create Agent Skills](./creating-skills.md)