Replace "your memory system" with explicit MemPalace references and
tool names (mempalace_diary_write, mempalace_add_drawer, mempalace_kg_add)
in stop and precompact hook block reasons. This prevents Claude Code from
misinterpreting the hook as a native auto-memory save instruction.
Updated in both Python (hooks_cli.py) and standalone shell scripts.
Also fix CONTRIBUTING.md Getting Started to show the fork-first workflow,
matching the PR Guidelines section.