Add per-card interoperable SCL export

[masarray]

Scope

• add a Save SCL icon to every IED card and move the remove X to the card's top-right corner
• prompt for Edition 2 or Edition 1 before choosing the output path
• export an IP-discovered IED from the last successful complete live MMS discovery model
• export an opened SCL card as a generic interoperable single-IED document
• use InteroperableSclConverter for opened-SCL Edition 2 output
• use schema-aware LiveIedSclExporter for opened-SCL Edition 1 and live-discovery Edition 2/1 output
• save Edition 2 as IID and Edition 1 as ICD
• write companion JSON evidence and Markdown summary beside the SCL output
• surface converter/exporter findings in Diagnostics
• retain the complete live discovery model on the card after disconnect
• require Re-scan for a project restored from signal cache only, rather than exporting an incomplete model as if it were complete
• align application and portable package metadata at 1.6.10

Per-card behavior

Opened SCL

• Edition 2: source SCL → ARIEC61850 generic interoperable single-IED conversion
• Edition 1: typed SclWorkspace.DesignModel → Edition 1 schema-aware export
• pressing Save does not initiate live MMS discovery

IP discovery

• successful full discovery stores LastLiveModel on the IED card
• Edition 2 and Edition 1 are exported from that complete typed live model
• the snapshot remains available after disconnect

Safety and regression boundaries

• no application-owned SCL parser or exporter is introduced
• all SCL output is produced through ARIEC61850 typed export services
• existing P0 atomic single Confirm button remains intact
• existing P1 grouped SCL diagnostics remain intact
• cached signal-only project data is not misrepresented as a complete discovery model

Validation

GitHub Actions Build ArIED 61850 #182 completed successfully:

• source, website, external-IP, and license-boundary verification
• ARIEC61850 Smart Control and Workspace API gates
• LiveIedSclExporter.WriteFiles gate
• InteroperableSclConverter.WriteFiles gate
• Edition 2 v3.1 and Edition 1 v1.6 schema-profile gates
• .NET restore
• Release build
• portable Windows x64 publish
• artifact upload

Artifact: ArIED61850-win-x64

SHA-256: 6aab63c7ce6e195999472850490bd01edef83435d2924b12228159bcc996d3ab

Final diff

Eleven production/documentation/workflow files only. Temporary staging payloads and apply workflows were removed before final validation.