fix(okr): B2 ingestion-kode-hygiene + bump 1.7.1 (patch-lane)

8 hygiene-fikser fra review 2026-07-16 par.4 kode-lista, TDD roed-groenn
(suite 138 -> 149):
- innboks-split: slugify translittererer ae/oe (datatap-fiks)
- innboks-frontmatter: beskrivende feil ved manglende sourceMtime
- okf-index: --okf-version bumper eksisterende rot, flagg-tolerant CLI
  (exit 2 ved manglende verdi), sanitizeEntry strip C1/zero-width/bidi/
  Unicode-tag
- write-org-profile: circuit-breaker MERGER i stedet for aa overskrive
  full config (M4); test beviser at eksisterende config overlever
- compose-org-profile: intern ----linje trunkerer ikke blokken
- coaching-hook: at-risk teller status-markerte tabellrader (M1/m1)
- inject-okr-context: topic-guard treffer boeyningsformer (maalene)
- frontmatter: BOM/CRLF-toleranse (falsk mangler-type-fiks)

Versjonsflater bumpet til 1.7.1 (package/plugin/lock/CLAUDE/README/
SKILL x2/package-shape-test) + CHANGELOG 1.7.1-seksjon (B1+B2).
Release-tag + katalog-ref venter paa [G-B] operatoer-go.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/innboks-frontmatter.mjs

@@ -57,11 +57,20 @@ function deriveDescription(body) {
 
 // concept (fra splitConcepts) -> beriket konsept med OKF-frontmatter + destRel.
 export function projectFrontmatter(concept, { sourcePath, sourceMtime } = {}) {
+  // B2: timestamp er mtime-basert (idempotens by construction) -- en manglende/
+  // ugyldig sourceMtime skal feile beskrivende her, ikke som naken RangeError
+  // fra toISOString (og ALDRI falle tilbake til veggklokka).
+  const mtime = new Date(sourceMtime ?? NaN);
+  if (Number.isNaN(mtime.getTime())) {
+    throw new TypeError(
+      `projectFrontmatter: opts.sourceMtime maa vaere gyldig Date/ms-epoch (fikk: ${sourceMtime})`,
+    );
+  }
   const resource = String(sourcePath ?? '');
   const type = deriveType(concept.title, resource);
   const description = deriveDescription(concept.body);
   const tags = deriveTags(concept.title);
-  const timestamp = new Date(sourceMtime).toISOString();
+  const timestamp = mtime.toISOString();
   const destRel = `${routeLevel(type)}/${concept.slug}.md`;
 
   // Kanonisk noekkel-rekkefolge; description/tags utelates naar tomme.