Bump the workspace to 0.5.0 !9

merged merged by cmc on 2026-09-04 14:24 UTC · krz/ambient-companions:release/v0.5.0 into main

cmc

[workspace.package] version 0.4.0 -> 0.5.0 and the three workspace entries in Cargo.lock. No dependency moved.

Adds the "Contract freeze ✅ Done (v0.5)" roadmap entry, matching how the v0.4 work is recorded.

Tagged v0.5.0 once merged.