Lands docs/plans/2026-10-21_t1-sessions.md as of2c843d190on origin/huey/t1-sessions-design (347278044,e19e30df2,2c843d190oncca206cdc) with its three BUILD-LOG and three SESSIONS append lines, onto the current refactor tip. The design blob is unchanged. Build dependency N2 (Claude completed-compaction format and the managed dataRoot reader) is Vikunja 466.