release: v7.0.0

[mellonis]

Summary

Bumps all 5 packages from 7.0.0-alpha.8 to 7.0.0 lockstep, adds the consolidated [7.0.0] CHANGELOG entries, cleans README prerelease markers.

Once merged, v7 HEAD becomes the stable v7.0.0 commit. The v7 → master integration PR (#167) picks up the bump automatically; flip #167 to ready, merge, then npx lerna publish from-package --yes from master.

What changed

• lerna version 7.0.0 --no-git-tag-version --no-push --yes — bumps all 5 packages + lerna.json + lockfile
• Peer-dep ranges in builder / library-binary-numbers / library-binary-numbers-bare / visuals widened to ^7.0.0
• CHANGELOG [7.0.0] - 2026-06-03 entries added to all 5 packages
• README prerelease markers flipped (visuals (v7+, prerelease) → (v7+), etc.)

Test plan

• npm install from cold lockfile resolves
• npm run build — clean
• npm test — 664/664
• npm run lint — 0/0
• npm run typecheck — clean
• npm publish --dry-run --workspaces --tag latest — all 5 packages publish with version 7.0.0 and tag latest

After this merges

1. Flip v7 release: composition-representation overhaul #167 (v7 → master) from draft to ready
2. Merge v7 release: composition-representation overhaul #167 — non-squash to preserve alpha trajectory
3. From master: npx lerna publish from-package --yes (NO --dist-tag next — this is latest)
4. gh release create v7.0.0 --target master --title v7.0.0 --notes-file <prose-file> (stable, NOT prerelease)