[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/kollektivvertrag-bergwerke-stahl-eisenhuettenwerke-2025.md

@@ -0,0 +1,12 @@
+>
+
+Räumlicher Geltungsbereich:
+ 
+ 
+ Österreichweit
+
+**Hinweis:**
+
+Der Rahmen-Kollektivvertrag ist derzeit nur als PDF-Download verfügbar.
+
+ (/oe/kollektivvertrag/kollektivvertrag-bergwerke-stahlindustrie-arbeiter-2025.pdf)Arbeiterkollektivvertrag in der für den Fachverband Bergwerke und Stahl für den Verband der Eisenhüttenwerke geltenden Fassung, Stand: 1.11.2025 und 1.11.2026