Release 0.4.0

What's Changed

• ci: bump rht and ontologies-registry pins to current main by @zircote in #32
• ci(publish): retry the workspace publish until the plan drains by @zircote in #33
• feat(mif-rh): confusion-matrix export from calibrate by @zircote in #42
• feat(mif-rh): score negative_examples via the policy-gated demotion gate by @zircote in #43
• chore(release): v0.4.0 by @zircote in #44

Full Changelog: v0.3.1...v0.4.0