docs: add wiki enable step to agentic-wiki-writer and agentic-wiki-coder (#280)

* Initial plan

* doc: add wiki enable instructions to agentic-wiki-writer and agentic-wiki-coder docs

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>
Co-authored-by: Russell Horton <mrjf@github.com>

Author: Copilot

docs/agentic-wiki-coder.md

@@ -55,7 +55,12 @@ It does **not** open a PR for typo fixes, formatting changes, or clarifications
 
 ### Setup
 
-This workflow requires your repository to have a wiki enabled. It pairs naturally with [Agentic Wiki Writer](agentic-wiki-writer.md) to create a full bidirectional documentation loop.
+This workflow requires your repository to have a wiki enabled and initialized:
+
+1. **Enable the wiki**: Go to your repository's **Settings** → **Features** and check the **Wikis** checkbox.
+2. **Initialize the wiki**: Go to the **Wiki** tab and create a blank page (e.g. "Home"). GitHub does not create the underlying wiki git repository until at least one page exists.
+
+It pairs naturally with [Agentic Wiki Writer](agentic-wiki-writer.md) to create a full bidirectional documentation loop.
 
 After editing the workflow file, run `gh aw compile` to update the compiled workflow and commit all changes to the default branch.
 

docs/agentic-wiki-writer.md

@@ -7,7 +7,9 @@
 The [Agentic Wiki Writer workflow](../workflows/agentic-wiki-writer.md?plain=1) keeps your project's GitHub wiki synchronized with the codebase. Once a day (if any pull requests were merged to the default branch), it reads a `PAGES.md` template to understand what to document, then writes wiki pages directly from the source code. You can also trigger it manually on demand.
 
 > [!WARNING]
-> **The repository wiki must be initialized before running this workflow.** GitHub does not create the wiki git repository until at least one page exists. Go to your repository's **Wiki** tab and create a blank page (e.g. "Home") to initialize it. The workflow will fail with a git clone error if this step is skipped.
+> **The repository wiki must be enabled and initialized before running this workflow.**
+> 1. **Enable the wiki**: Go to your repository's **Settings** → **Features** and check the **Wikis** checkbox.
+> 2. **Initialize the wiki**: Go to the **Wiki** tab and create a blank page (e.g. "Home"). GitHub does not create the underlying wiki git repository until at least one page exists. The workflow will fail with a git clone error if this step is skipped.
 
 ## Installation