Add CUPS print server container for Brother HL-4150CDN

.opencode/skills/jujutsu/references/PUSH.md

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+### Pushing Changes
+
+When the user asks you to push changes:
+
+```bash
+# Push a specific bookmark to the remote
+jj git push -b <bookmark-name>
+
+# Example: push the main bookmark
+jj git push -b main
+```
+
+**Before pushing, ensure:**
+1. Your bookmark points to the correct commit (bookmarks don't auto-advance like git branches)
+2. The commits are refined and atomic
+3. The user has explicitly requested the push
+
+**IMPORTANT**: Unlike git branches, jj bookmarks do not automatically move when you create new commits. You must manually update them before pushing:
+
+```bash
+# Move an existing bookmark to the current commit
+jj bookmark move my-feature --to @
+
+# Then push it
+jj git push -b my-feature
+```
+
+If no bookmark exists for your changes, create one first:
+
+```bash
+# Create a bookmark at the current commit
+jj bookmark create my-feature
+
+# Then push it
+jj git push -b my-feature
+```
+
+For named remotes, multi-remote setups (e.g. fork + upstream), tracking remote bookmarks, and one-time configuration for the two canonical multi-remote workflows, see `references/REMOTES.md`.