[IMP] odoo-at-payroll: record GP0 source work and GP1 runtime setup in docs

Documentation-only updates from the General-AT track (2026-09-10/11)
that had been left uncommitted; no code changes.

- RECHTSQUELLEN-Privat: new section 13 (cross-check of all 571 KB
  legal_bases citation strings, ~130 statutes, against the binding RQ
  inventory; outside-scope delimitation) and procurement-list
  extensions in section 11 (AVRAG, ASVG contribution/notification
  block, EStG, KommStG/BAO, AUEG, UrlG, BMSVG, IESG, LohnkontenVO,
  Mutterschutz-/Karenz block as scope decision)
- IMPLEMENTIERUNGSPLAN-Privat: new section 2.1 (knowledge-base binding
  regime, KB as curated secondary source with ID and Stand), GP2-GP8
  fine mechanics backed by KB entries, new open points 8.11 DZ
  surcharge decision, 8.12 KB conflict families for RIS clarification
  and 8.13 scope candidates; source reference updated to the
  odoo_19.0+e.20260910 tree
- CHANGELOG: 2026-09-10 entries for the primary-source procurement
  (19 RIS statutes via RIS title search incl. short-title traps, LStR
  2002 findok XML, DM-ORG 42.7.0 with L16/L17 checklists, SV values
  2026), the KB legal-basis cross-check and the plan knowledge-base
  integration; the 'Krankengeldumlage par. 62 ASVG' false premise is
  resolved and corrected in RQ and plan
- README and module README: dev-host runtime documentation (PostgreSQL
  18.6, Python 3.14 venv with editable install of the merged tree,
  odoo_dev database, test invocation via .venv/bin/python -m odoo;
  GP1 test_kv_katalog green, 8 tests 0 errors)
- .gitignore: odoo_19.0+e.20260910/ and .venv/ replace the removed
  odoo/ and odoo_enterprise/ checkouts; ignore local tooling
  (.zed-hours/, /tools/ anchored to the repo root so
  personalverrechnung/tools stays fully tracked)

addons/l10n_at_hr_payroll_private/README.md

@@ -48,6 +48,7 @@ FI-Buchung UGB.
 
 Tests: `test_kv_katalog` (Seed, Stichtags-Lookup, Versionierung,
 Eckwerte, Wizard/Sprungwarnung, Vertragsfelder) —
-`python3 odoo/odoo-bin -d <testdb> -i l10n_at_hr_payroll_private
+`.venv/bin/python -m odoo -d <testdb> -i l10n_at_hr_payroll_private
 --test-tags /l10n_at_hr_payroll_private --test-enable --stop-after-init
---addons-path=odoo_enterprise/odoo/addons,addons`
+--addons-path=odoo_19.0+e.20260910/odoo-19.0+e.20260910/odoo/addons,addons`
+(Lokale GP1-Runtime grün am 2026-09-11, 8 Tests 0 Fehler.)