Add CUPS print server container for Brother HL-4150CDN

openspec/changes/add-cups-printserver-container/proposal.md

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+# Proposal
+
+## Why
+
+Provide a Podman container that runs CUPS and shares the Brother HL-4150CDN network printer as an AirPrint and IPP printer. Clients should be able to print without installing local printer drivers.
+
+## What Changes
+
+- Create a Containerfile for Podman (based on a Linux distro that supports CUPS and 32-bit binaries)
+- Extract and install Brother driver files (from `assets/Brother HL-4150CDN/` - local .deb packages: `hl4150cdnlpr` and `hl4150cdncupswrapper`) needed for HL-4150CDN
+- Configure CUPS to run in the container and share the network printer
+- Enable mDNS/Avahi for AirPrint discovery
+- Provide minimal runtime configuration (ports 631, 5353/udp) and documentation for running with podman
+- Handle 32-bit dependencies required by Brother i386 binaries
+
+## Capabilities
+
+### New Capabilities
+- `printserver/cups`: Containerized CUPS print server with AirPrint/IPP sharing and Brother HL-4150CDN driver support
+
+### Modified Capabilities
+None
+
+## Impact
+
+- New Containerfile (and possibly supporting files) in repository root
+- Uses Brother driver artifacts in `assets/Brother HL-4150CDN/`
+- Runtime ports: CUPS (631), mDNS (5353/udp) for AirPrint
+- Depends on Avahi/DBus, CUPS, and 32-bit compatibility libs for Brother binaries