feat(ms-ai-architect): add plugin to open marketplace (v1.5.0 baseline)

Initial addition of ms-ai-architect plugin to the open-source marketplace.
Private content excluded: orchestrator/ (Linear tooling), docs/utredning/
(client investigation), generated test reports and PDF export script.
skill-gen tooling moved from orchestrator/ to scripts/skill-gen/.

Security scan: WARNING (risk 20/100) — no secrets, no injection found.
False positive fixed: added gitleaks:allow to Python variable reference
in output-validation-grounding-verification.md line 109.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/ms-ai-architect/NOTICE.md

@@ -0,0 +1,40 @@
+# Attribution Notice
+
+## Microsoft Learn Documentation
+
+This project contains adapted material derived from [Microsoft Learn](https://learn.microsoft.com) documentation, which is licensed under the [Creative Commons Attribution 4.0 International License (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/).
+
+The original documentation is copyright Microsoft Corporation and contributors.
+
+### What has been adapted
+
+The reference files in the skill-specific `references/` directories have been:
+
+- **Translated** from English to Norwegian
+- **Reorganized** into a domain-specific knowledge structure
+- **Synthesized** across multiple source articles into consolidated reference documents
+- **Augmented** with original analysis, decision guidance, and Norwegian public sector context
+
+### Source verification
+
+The majority of reference files (~98%) include a "Kilder og verifisering" section at the end of each file, listing the specific Microsoft Learn URLs used as sources. These URLs were verified at the time of generation via the [Microsoft Learn MCP server](https://github.com/nicholasgriffintn/microsoft-learn-mcp).
+
+### Code samples
+
+Code samples derived from Microsoft Learn documentation are used under the [MIT License](https://opensource.org/licenses/MIT), consistent with MicrosoftDocs repository licensing.
+
+## Original content
+
+The following content is original work and not derived from Microsoft Learn:
+
+- Plugin architecture (commands, agents, hooks, orchestrator)
+- The "Cosmo Skyberg" architect persona and decision methodology
+- Diagram prompt templates (`architecture/diagram-prompt-templates.md`)
+- Decision trees and synthesis across multiple platform domains
+- Norwegian public sector governance analysis
+
+## Trademarks
+
+Microsoft, Azure, Microsoft 365, Copilot, Copilot Studio, Power Platform, and other product names are trademarks or registered trademarks of Microsoft Corporation. Their use in this project is for identification purposes only and does not imply endorsement by Microsoft.
+
+This project is not endorsed by, affiliated with, or sponsored by Microsoft Corporation.