New resolution order for the Plannotator data directory:
1. PLANNOTATOR_DATA_DIR (unchanged, top priority, ~ expansion)
2. ~/.plannotator when it already exists (legacy default — existing
installs never move)
3. $XDG_DATA_HOME/plannotator when XDG_DATA_HOME is set to a
non-empty absolute path
4. ~/.plannotator (default for everyone else)
This is git's legacy-first pattern: the XDG branch only fires for fresh
installs whose user has explicitly set XDG_DATA_HOME. The XDG spec's
implicit ~/.local/share default is deliberately NOT applied, and the
directory stays monolithic (no config/data/cache split).
Mirrored in every private copy of the resolver: the Amp plugin,
scripts/install.sh, scripts/install.ps1, and scripts/install.cmd. The
Pi runtime picks the change up automatically via vendor.sh. Docs updated
in README.md, AGENTS.md/CLAUDE.md, and the marketing env-var reference.
Claude-Session: https://claude.ai/code/session_01YXkgsNucxDwAL4GdR4XYRk
Michael Ramos