squad init: agent invisible when CWD is inside a parent git repo #374

Problem

When running squad init in a directory that is a subdirectory of a parent git repository, the Squad agent (.github/agents/squad.agent.md) is created at the CWD but is invisible to copilot --agent squad.

Root cause: Copilot resolves .github/agents/ relative to git rev-parse --show-toplevel (the git root), not relative to CWD. If CWD is inside a parent git repo, the git root points to the parent directory — where the agent file doesn't exist.

Reproduction:

1. Accidentally run git init in a parent directory (e.g., C:\src\)
2. mkdir child && cd child
3. squad init
4. copilot --agent squad → No such agent: squad

The agent file exists at child/.github/agents/squad.agent.md but copilot looks at parent/.github/agents/ — wrong path.

Fix

Added detectParentGitRepo() to packages/squad-cli/src/cli/core/init.ts:

• Compares CWD to git rev-parse --show-toplevel
• If they differ, warns the user and auto-runs git init to create a proper repo boundary
• Gracefully handles no-git environments (catch block, no crash)

Commit: a9eee03 on dev