WIP: Liveness incentive work, second try

[cwgoes]

Replaces #3494
Ref #3529 - this PR is just to keep the branch for reference (don't close), let's discuss in the issue first.

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[cwgoes]

Closing, we're not doing this pre-launch.