fix(trae): support Trae CLI Next hooks

[Hayak3]

Summary

• Keep legacy Trae IDE hooks at ~/.trae/hooks.json
• Add separate Trae CLI Next hooks at ~/.trae/cli/hooks.json
• Use TraeX-supported PascalCase hook events for Trae CLI Next instead of legacy Trae IDE events like beforeReadFile
• Clean up CodeIsland-managed legacy Trae IDE entries if they were written into the new Trae CLI Next hooks file

Background

Trae CLI Next no longer reads ~/.trae/hooks.json. It reads ~/.trae/cli/hooks.json, but that file must use the TraeX hook event schema. Reusing the old Trae IDE event list causes parse errors such as:

unknown hook event: "beforeReadFile"

Verification

• swift build -c release passed
• git diff --check passed
• swift test --filter ... could not run on this machine because the active developer directory is CommandLineTools and XCTest is unavailable; debug test builds also hit an existing SwiftUI #Preview / PreviewsMacros
  environment issue