Add process duplication publication

[Weidong Cui (wdcui)]

This PR adds atomic broker-core publication for admitted process-duplication transactions, validates immutable child creation provenance, promotes a successfully prepared staged child to running while releasing the transaction slot, preserves publication across parent cancellation or death, and fails and shuts down staged children that cannot be published.

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

Click for details

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/inherent_method_missing.ron

Failed in:
  DuplicationTransaction::child_id, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/2584bd20899e8985b91c1180c3f0e909c8103ba4/litebox_broker_core/src/process.rs:260