docs: improve AGENTS.md formatting and update internal-docs

- Add blank lines to AGENTS.md for better readability
- Update internal-docs submodule to include v1.5.0 planning and v1.4.0 feedback

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: PatrickSys

AGENTS.md

@@ -1,21 +1,25 @@
 # Agent Instructions
 
 ## Internal Documentation
+
 This repository uses a private git submodule for internal notes.
 
 - **Path**: `internal-docs/`
 - **Repo**: `https://github.com/PatrickSys/codebase-context-internal.git`
 
 ### Quick Setup
+
 ```bash
 git clone --recurse-submodules https://github.com/PatrickSys/codebase-context.git
 ```
 
 ### Syncing
+
 ```bash
 git pull --recurse-submodules
 git submodule update --remote --merge
 ```
 
 ### Privacy & Security
+
 The `internal-docs` repository is **Private**. It returns a 404 to unauthenticated users/APIs. Access requires a GitHub PAT or SSH keys with repository permissions.