fix(copilot): DetectPresence delegates to AreHooksInstalled

[peyton-alt]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk: changes are limited to Copilot CLI agent presence detection and its unit tests/documentation, with no effect on session I/O or hook installation logic.

Overview
Updates Copilot CLI agent DetectPresence to stop treating .github/hooks/ as sufficient and instead report presence only when AreHooksInstalled finds Entire hook entries in .github/hooks/entire.json.

Adjusts tests to cover the new behavior (no hooks dir, hooks dir without entire.json, and entire.json containing an Entire command), and updates the Copilot CLI integration doc to reflect the stricter detection rule.

^{Written by Cursor Bugbot for commit 3516afb. Configure here.}

[Copilot]

Pull request overview

Updates Copilot CLI agent presence detection to only report “present” when Entire-managed Copilot CLI hooks are actually installed (via .github/hooks/entire.json), aligning detection behavior with the hook installation logic.

Changes:

• Change DetectPresence to delegate to AreHooksInstalled (instead of checking only for a .github/hooks directory).
• Expand/adjust unit tests to cover “hooks dir exists but no entire.json” vs “entire.json contains Entire hooks”.
• Update Copilot CLI agent documentation to describe the new presence detection criteria.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
cmd/entire/cli/agent/copilotcli/copilotcli.go	Makes presence detection rely on AreHooksInstalled for accurate detection of Entire hooks.
cmd/entire/cli/agent/copilotcli/copilotcli_test.go	Updates/extends tests to validate presence detection based on entire.json contents, not just directory existence.
cmd/entire/cli/agent/copilotcli/AGENT.md	Documents the new presence detection behavior and the required hook prefixes.