Append rather than overwrite configs during `lat init`

[lars20070]

Background

Most configs for Copilot, Cursor, Claude Code etc. are appended rather than overwritten during lat init which is good.

Problem

.cursor/hooks.json is overwritten during lat init and therefore existing hooks deleted.

Suggestion

1. Append .cursor/hooks.json
2. Some projects have the Claude config hidden in .claude/CLAUDE.md. Check whether ./CLAUDE.md or ./.claude/CLAUDE.md exist and append the relevant file.