feat(ms-ai-architect): Sesjon 2 - registry-skjema (authority_source + course reservert)

build-registry leser na **Source:**/**Primary source:**-header via ny
lib/kb-headers.mjs (parseSourceHeader, 7 enhetstester) og logger dekning
(0/N i dag). Hver URL-entry far reserverte felt authority_source:null +
course:null (bakoverkompatibelt). Populering med korrekt semantikk utsatt
til verifiseringslaget (lag 3) - minimal-reservert per operator-valg.

Eksisterende status-felt (poll: tracked/not_in_sitemap/unpolled) urort for
a unnga kollisjon. kb-update 56 tester gronne.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01REiKFhP4w6xGXXqWKpPCJJ

scripts/kb-update/build-registry.mjs

@@ -9,6 +9,7 @@ import { join, relative, dirname } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { normalizeUrl, extractUrls } from './lib/url-normalize.mjs';
 import { loadRegistry, saveRegistry } from './lib/registry-io.mjs';
+import { parseSourceHeader } from './lib/kb-headers.mjs';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const PLUGIN_ROOT = join(__dirname, '..', '..');
@@ -34,6 +35,7 @@ function walkMd(dir) {
 const existing = merge ? loadRegistry() : null;
 const urlToFiles = new Map(); // normalizedUrl → Set<relativePath>
 let totalFiles = 0;
+let filesWithSourceHeader = 0; // coverage of the optional **Source:** authority header
 
 const skillDirs = readdirSync(SKILLS_DIR, { withFileTypes: true })
   .filter(d => d.isDirectory())
@@ -49,6 +51,11 @@ for (const skill of skillDirs) {
     const urls = extractUrls(content);
     const relPath = relative(PLUGIN_ROOT, file);
 
+    // Read the optional **Source:**/**Primary source:** authority header.
+    // 0% coverage today; tracked here so we can populate authority_source as
+    // files adopt it (population semantics designed in the verification layer).
+    if (parseSourceHeader(content)) filesWithSourceHeader++;
+
     for (const url of urls) {
       if (!urlToFiles.has(url)) urlToFiles.set(url, new Set());
       urlToFiles.get(url).add(relPath);
@@ -72,6 +79,10 @@ for (const [url, files] of urlToFiles) {
     sitemap_lastmod: prev?.sitemap_lastmod || null,
     reference_files: [...files].sort(),
     status: prev?.status || 'unpolled',
+    // Reserved schema (lag 0): authority_source = declared verification source
+    // (**Source:** header, 0% coverage today); course = Learn course-track ref.
+    authority_source: prev?.authority_source ?? null,
+    course: prev?.course ?? null,
   };
 }
 
@@ -81,6 +92,7 @@ saveRegistry(registry);
 const multiRef = [...urlToFiles.values()].filter(s => s.size > 1).length;
 console.log(`Registry built: ${urlToFiles.size} unique URLs from ${totalFiles} files`);
 console.log(`  URLs referenced by multiple files: ${multiRef}`);
+console.log(`  Files declaring **Source:** header: ${filesWithSourceHeader}/${totalFiles}`);
 if (merge && existing?.urls) {
   const newUrls = [...urlToFiles.keys()].filter(u => !existing.urls[u]).length;
   console.log(`  New URLs added (merge): ${newUrls}`);

scripts/kb-update/lib/kb-headers.mjs

@@ -0,0 +1,26 @@
+// kb-headers.mjs — Parse optional authority headers from KB reference files.
+// Zero dependencies. Scans only the top of the file (header region) where the
+// **Source:** / **Primary source:** line lives, mirroring report-changes'
+// parseLastUpdated convention.
+
+const HEADER_REGION_BYTES = 500;
+
+const SOURCE_PATTERNS = [
+  /\*\*Source:\*\*\s*(\S+)/i,
+  /\*\*Primary source:\*\*\s*(\S+)/i,
+];
+
+/**
+ * Extract the declared authority source URL from a KB reference file's header.
+ * @param {string} content — full file content (only the first 500 bytes are scanned)
+ * @returns {string|null} the source URL, or null if no header is present
+ */
+export function parseSourceHeader(content) {
+  if (!content || typeof content !== 'string') return null;
+  const head = content.slice(0, HEADER_REGION_BYTES);
+  for (const pattern of SOURCE_PATTERNS) {
+    const match = head.match(pattern);
+    if (match) return match[1].trim();
+  }
+  return null;
+}