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/.gitignore

@@ -0,0 +1,15 @@
+*.local.md
+.claude/settings.local.json
+.mcp.json
+.DS_Store
+
+# Secrets
+.env
+*.key
+*.pem
+credentials.*
+
+orchestrator/state.json
+orchestrator/logs/
+.work/
+org/