Remove deprecated inline-sub-agents mentions from docs

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

Author: Copilot

.github/aw/subagents.md

@@ -8,12 +8,6 @@ Inline sub-agents let you define specialised agents directly inside a workflow m
 
 ---
 
-## Enabling the Feature
-
-Inline sub-agent extraction is always on — no config needed. The deprecated `features.inline-agents` and `inline-sub-agents` fields should be removed from frontmatter.
-
----
-
 ## Syntax
 
 Define a sub-agent with a level-2 Markdown heading of the form `## agent: \`name\``:

docs/src/content/docs/reference/inline-sub-agents.md

@@ -7,8 +7,6 @@ sidebar:
 
 An inline Copilot sub-agent is a named agent definition embedded directly in a workflow markdown file. Instead of creating a separate file in `.github/agents/`, you define the agent's frontmatter and instructions in a dedicated section of the same workflow file.
 
-Inline sub-agents are enabled by default. Both `features.inline-agents` and `inline-sub-agents` are deprecated and should be removed from frontmatter.
-
 ## Syntax
 
 Start a sub-agent block with a level-2 heading in the following form: