0.2.0 — zsh support

zsh support + uniform CI.

• Utilities run under zsh (ksh emulation; requires xsh ≥ 0.7.0): query.sh ${!var}→eval; query/parser.sh read -a→word-split.
• Add a functional test.sh and the bash 3.2/4.4/5.x + zsh 5.x CI matrix.
• Requires xsh-lib/core ≥ 0.6.1 (the csv/parser gawk/Linux fix that query depends on).
• Standardized README badges + tested-platforms matrix.