fix: Correct install paths and update plugin.json
- README: scripts/install.sh → tools/install-unix.sh
- README: scripts/install.ps1 → tools/install-windows.ps1
- plugin.json: project-docs → doc-scanner (renamed)
- plugin.json: Remove safe-file-reader (deleted)
- plugin.json: Add rules/thinking.md
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Co-Authored-By: Claude <noreply@anthropic.com>