Add transactional adoption materialization

[iperev]

Summary

• add fail-closed plan, apply, and recovery commands for transactional adoption materialization
• bind repository mutations to canonical manifests, content identities, locks, journals, rollback, and terminal receipts
• extend CLI contracts, requirements, proof bindings, coverage witnesses, and the v0.8 release edge
• preserve frozen v0.7 evidence bytes while resolving its declared change-record reference

Validation

• npm run check with npm 12.0.2
• go test -race ./internal/kernel/repositorytransaction ./internal/command/adoptionmaterialization
• Linux arm64 tests in Docker with exact Go 1.27.1
• 93/93 requirements bound, 287 scenarios, 84 commands
• 93 Playwright scenarios passed across Chromium, Firefox, and WebKit

Non-claims

This PR does not establish registry publication, deployment, rollout, or production readiness. Transaction receipts remain local evidence subject to their declared authority class.