Split consolidation service modules

[yvette-carlisle]

Summary

• Split packages/elf-service/src/consolidation/service.rs into private runs, proposals, and review child modules.
• Kept the public service surface as the same inherent ElfService methods.
• Kept review-event hydration private to the consolidation service module tree and avoided include!, #[path], pub mod, or public re-exports for the new modules.

Validation

• cargo make fmt-rust
• cargo make check-rust
• cargo make lint-vstyle
• cargo make lint-rust
• cargo make test-rust (370 passed / 92 skipped)
• cargo make check (check-docs passed; nextest 370 passed / 92 skipped)
• cargo make test-rust-integration (92 passed / 370 skipped)

Review Notes

• Read-only scout selected this slice as lower-risk than SQL storage splits because the service responsibilities already separate into run, proposal, and review workflows.
• Read-only skeptic found no code-level blocker in the staged diff; its initial validation objection was resolved with the repo-native validation above, including a post-review cargo make check-rust rerun.