feat: add conventional-commits commit-msg hook

README.md

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+# Client-Side Git Hooks
+
+To use one of these hooks, copy them from the respective directory to `.githooks/` in your repository and name according to the parent directory, then execute
+```shell
+git config core.hooksPath .githooks
+```
+
+It is recommended to then document when you made the copy so you can later propagate upstream changes, eg:
+```shell
+#!/bin/sh -euC
+#
+# Reject commit messages that do not conform to Conventional Commits.
+#
+# Enforces Conventional Commits v1.0.0 at the syntactic level.
+# Also enforces a custom list of types.
+#
+# Upstream:	gitea.bp99.eu/bp99/git-hooks
+# Updated:	2026-07-15
+
+# [... contents ...]
+```
+
+## Tricks
+
+To avoid having to remember the `git` command, add a `Makefile` to your project with a `setup` target:
+```makefile
+setup:
+	git config core.hooksPath .githooks
+
+.PHONY: setup
+```
+Do not forget to communicate to contributors that this `setup` target should be executed after cloning the repo.