6.18.7 (2026-05-24) Documentation plan reduce buildContentLines complexity (#170) (9912d16) retro: add planning stage notes for issue #170 (3ed1b75) retro: add retro notes for issue #169 (419c451) retro: add TDD stage notes for issue #170 (75b3253) update architecture for message-formatters extraction (#170) (1005354)