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/tests/capture-fixture.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# capture-fixture.sh — Extract agent output fixture from a document
+# Usage: bash tests/capture-fixture.sh <source-file> <section-header> <output-dir>
+#
+# Example:
+#   bash tests/capture-fixture.sh docs/utredning/.../utredning.md "S5: Sikkerhetsvurdering" tests/fixtures/security-assessment/
+set -euo pipefail
+
+if [ $# -lt 3 ]; then
+  echo "Usage: $0 <source-file> <section-header> <output-dir>"
+  echo ""
+  echo "Extracts a section from source file and saves as fixture.md"
+  echo ""
+  echo "Example:"
+  echo "  $0 docs/utredning/file.md 'S5: Sikkerhetsvurdering' tests/fixtures/security-assessment/"
+  exit 1
+fi
+
+SOURCE="$1"
+HEADER="$2"
+OUTPUT_DIR="$3"
+
+if [ ! -f "$SOURCE" ]; then
+  echo "Error: Source file not found: $SOURCE"
+  exit 1
+fi
+
+mkdir -p "$OUTPUT_DIR"
+
+# Extract section from ## header to next ## header (or EOF)
+awk -v header="$HEADER" '
+  BEGIN { found=0 }
+  /^## / {
+    if (found) exit
+    if (index($0, header)) found=1
+  }
+  found { print }
+' "$SOURCE" > "$OUTPUT_DIR/fixture.md"
+
+LINES=$(wc -l < "$OUTPUT_DIR/fixture.md" | tr -d ' ')
+echo "Captured $LINES lines to $OUTPUT_DIR/fixture.md"