$HOME/.copilot/copilot-instructions.md not loaded into agent context

[decaoma-atlix]

Description

The user-level custom instructions file at $HOME/.copilot/copilot-instructions.md is not injected into the agent's context, even though it is documented as a supported path.

Steps to Reproduce

1. Create $HOME/.copilot/copilot-instructions.md with custom instructions.
2. Start a new Copilot CLI session.
3. Run /instructions — the file is listed but shown as not loaded.
4. The agent does not receive or act on the instructions in that file.

Expected Behavior

Per the help output and documentation:

Copilot respects instructions from these locations:
  …
  $HOME/.copilot/copilot-instructions.md
  …

The file should be automatically loaded into the agent's context at session start, alongside repo-level instructions (.github/copilot-instructions.md), which do load correctly.

Actual Behavior

• Repo-level .github/copilot-instructions.md → ✅ loaded
• User-level $HOME/.copilot/copilot-instructions.md → ❌ not loaded

The agent has no awareness of the user-level instructions unless the user manually reads the file during the session.

Environment

• CLI version: 1.0.9
• OS: Windows 11 (PowerShell 7)
• File exists: C:\Users\<user>\.copilot\copilot-instructions.md (confirmed)