feat: add self-improving automation foundation

[ScriptedAlchemy]

Stack

This is PR 1 of 5 replacing #114. It is the base PR for the self-improving loops stack.

Summary

• Adds the backend foundation for self-improving automation loops: config, scheduler, run ledgers, lifecycle, runners, managed skills, artifacts, and skill usage tracking.
• Extracts CLI command handlers into focused modules and wires the automation CLI surface through that structure.
• Extends agent/session plumbing needed by the automation backend, including Codex app-server behavior and transcript support.
• Adds focused backend tests for automation, CLI parsing/startup, managed skills, skill targets, skill usage, agent/session behavior, and cross-platform fake Codex fixtures.
• Updates CI, nextest, and conventional-commit hook scripts for the expanded test surface.

Verification

• cargo fmt --all -- --check
• git diff --check
• CI on the original equivalent tip was green before splitting.

Replaces part of #114.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3851b8f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: cb4fa138c6

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".