Cs Note

This is the disciplined counterpart to cs-learn and cs-trick. It appends one-line project facts to a fixed section in `.codestable/attention.md`, the file that CodeStable skills read on startup. The three-part filter is smart: length (one or two lines), frequency (needed almost every session), and stability (long-term constraints, not temporary workarounds). Typical entries are "run `pnpm gen` before build" or "don't use npm, project uses yarn berry." It won't let you bloat the file with background or multi-step guides, enforces a fixed set of subsections like "Build," "Environment Variables," and "Path Conventions," and checks for duplicates before writing. The 150-line soft cap keeps attention.md from becoming another junk drawer. One note per invocation, no batch writing.