[ADD] personalverrechnung: machine-readable KV library (all current collective agreements)

Cross-checked catalogue of all currently valid Austrian collective
agreements, per the source policy: main source = the responsible
employer-side chamber, kollektivvertrag.at (OEGB-Verlag) as complete
cross-check baseline.

- oegb/: 593 variants from kollektivvertrag.at with full consolidated
  texts (JSON primary format, Markdown for review/diff) plus
  catalog.json/.csv; fetched via the portal's JSON servlets
  (dashboard/structure/slices/topics), resumable
- wko/: 614 current documents from the WKO KV database (1,820 branch
  overviews across 10 regions) with texts and catalog; match-report
  against the baseline: 407 pairs, 30 date disagreements flagged
- chambers/chambers.json: curated registry of chamber-side sources and
  publication gaps (GOeD member-only, RA/Notariat not public, OCR-less
  scan PDFs, missing hospital-doctors KV)
- kv-catalog.json/.csv: merged catalogue, 768 entries, chamber
  classification, main_source, cross_check status, manual_review lists
- tools/fetch_kv_portal.py / fetch_wko_kv.py / build_kv_catalog.py:
  stdlib-only fetchers and merge step, each with a --refresh diff mode
- RUNBOOK.md: update cycle for keeping the library current (annual,
  tied to the Wartung rhythm and KV rounds)

Lohntafel PDFs are linked but not downloaded; wage tables contained in
the KV texts are converted. No Odoo module changes.

personalverrechnung/quellen/kv/wko/texts/gehaltsordnung-film-musikwirtschaft-angestellte-2026.json

@@ -0,0 +1,9 @@
+{
+ "title": "Gehaltsordnung Film- und Musikwirtschaft (Nichtfilmschaffende), Angestellte, gültig ab 1.1.2026",
+ "scope": {},
+ "archived_banner": false,
+ "pdf_links": [],
+ "external_links": [],
+ "slug": "gehaltsordnung-film-musikwirtschaft-angestellte-2026",
+ "url": "https://www.wko.at/kollektivvertrag/gehaltsordnung-film-musikwirtschaft-angestellte-2026"
+}