repo: add claude.md

CLAUDE.md

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+# CLAUDE.md
+
+## Style
+
+- Keep everything short: replies, explanations, comments, docs.
+- Use simple English: short sentences, common words.
+- Avoid em dashes (—). Do not just swap them for "-" either. Rewrite the sentence instead, for
+  example with a comma, a colon, brackets or two sentences.
+
+## Commits
+
+- English only.
+- Subject: `<package>: <what changed>`, the way CI writes it, for example
+  `plezy-bin: update to 2.21.0-1` or `bottles-opener: new package`. Several packages at once:
+  list them separated by commas.
+- Subject as short as possible. Imperative, lowercase, no trailing period.
+- Body only when something genuinely cannot be inferred from the diff.
+- Never add `Co-Authored-By`, "Generated with" or any other AI attribution to commits or PR descriptions.
+
+## Packages
+
+- Read README.md first. The ground rule there decides what a package may do: this repository never
+  hosts a binary of our own, and `-bin` is only for what upstream published.
+- One directory per package with `PKGBUILD` and `pkg.sh`. `pkg.sh` tells CI how to find the newest
+  version and how to refresh the checksums.
+- Never bump `pkgver` or checksums by hand: CI does that every six hours.