Add proboctl release track

Signed-off-by: Émile Ré <emile@probo.com>

contrib/claude/release/proboctl.md

@@ -0,0 +1,22 @@
+# Release `proboctl`
+
+After confirming commits below, follow the
+[common steps](./README.md#3-common-steps-every-track).
+
+## Track facts
+
+- **Tag pattern**: `proboctl/v*`
+- **Version source**: `cmd/proboctl/VERSION` (single `X.Y.Z` line)
+- **Version bump**: Edit `cmd/proboctl/VERSION` directly
+- **Changelog**: `cmd/proboctl/CHANGELOG.md`
+- **Files to stage**: `cmd/proboctl/VERSION`, `cmd/proboctl/CHANGELOG.md`
+- **Path filter**: `cmd/proboctl pkg/proboctl`
+
+## Detect commits
+
+```shell
+git log $(git describe --tags --abbrev=0 --match='proboctl/v*')..HEAD --oneline \
+  -- cmd/proboctl pkg/proboctl
+```
+
+If empty or non-user-facing only, do not release this track.