Bump the workspace to 0.4.0 !5

merged merged by cmc on 2026-09-04 05:02 UTC · krz/ambient-companions:release/v0.4.0 into main

cmc

Version bump only: [workspace.package] version 0.3.0 -> 0.4.0, and the three workspace entries in Cargo.lock. No dependency moved.

Tagged v0.4.0 once merged.