Primary-source check against bas.se (BAS 2026 v2): the official kontoplan
has no account 2012; the enskild firma equity block is 2010, 2011, 2013,
2017, 2018, 2019. 2012 'Avräkning för skatter och avgifter' is a program
convention (Visma, Bokio, Björn Lundén), not standard BAS, and a
non-standard account in BAS_REFERENCE leaks via the backfill into charts,
SIE export and SRU filing.
- remove 2012 from class-2-equity-liabilities.ts, with a tombstone comment
- migration retargets 'Preliminär F-skatt (EF)' lines 2012 -> 2013
(system row plus any clones still carrying the seeded shape)
- pin 2012's absence in bas-ef-equity-accounts.test.ts (2113 precedent)
- correct the swedish-year-end-closing references that motivated #1388,
regenerate atom seed migration
Companies whose charts already got 2012 backfilled keep it: existing
history stays valid; only future template use books 2013.
Closes#1409
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
