feat: Add GoM (Grundsätze ordnungsmäßiger Modellierung) semantic anchor

[Copilot]

Adds GoM — Grundsätze ordnungsmäßiger Modellierung (Principles of Proper Modeling) — a well-established German framework defining six quality criteria for enterprise and business process models, originally published by Becker, Rosemann & Schütte in WIRTSCHAFTSINFORMATIK (1995).

New files

• docs/anchors/gom.adoc — English anchor covering all six principles: Correctness, Relevance, Economic Efficiency, Clarity, Comparability, Systematic Design
• docs/anchors/gom.de.adoc — German translation

Updated files

• docs/all-anchors.adoc — Included in the Software Architecture section (alphabetical order)
• docs/metadata/roles.yml — Role mapping: software-architect, business-analyst, consultant, team-lead
• website/public/data/*.json — Regenerated; anchor count 52 → 53

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Anchor Proposal]: GoM</issue_title>
<issue_description>### Proposed Term

GoM

Context (Optional)

No response

Pre-submission Checklist

• I have searched existing anchors and this term is not already included
• This term refers to a well-established concept (not something I invented)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Anchor Proposal]: GoM #126

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