v0.9.0

Added

• Resolve .agro/, agro.json, AGRO_*, and ~/.agro beside their legacy names through one fail-closed compatibility contract with a migration engine; defaults are unchanged. (#940)
• Add the agro CLI as @mifune/agro with agro update self-upgrade, the artifact-only get-agro.sh installer, and ghcr.io/mifunedev/agro images; oh stays the compatibility alias. (#941)