Add engineering leadership demo: review throughput and backlog burn-down

[devin-ai-integration]

Summary

demos/ previously covered four job functions (data engineering, security, migration, application development). Engineering managers / delivery leads had nothing to watch. This adds that fifth category with one facilitator-led demo whose centerpiece is Devin Review as a standing reviewer across four repos, not a footnote step.

New file: demos/engineering-leadership/review-throughput-and-backlog-demo.md (579 lines, single linear thread, ToC with anchors, Key Takeaways).

The thread, in order:

1. Write the review standard down — the demo's first step creates REVIEW.md at the root of otterworks, timesheet-app, eventflow-order-service, and petclinic-angular (verified: none of the four has one on main today), then promotes the cross-repo rules into a Knowledge note and a playbook source alongside the repo's existing .workshop/playbooks/synthetic-testdata-generation.devin.md. This is the management artifact the rest of the doc leans on, and it is inherently multi-repo work.
2. Devin Review on a human PR — a real edit to services/api-gateway/internal/middleware/ratelimit.go with ratelimit_test.go deliberately left untouched, so the coverage-gap finding is the expected output. Followed by a cross-repo review-load report (docs/REVIEW_LOAD.md).
3. The loop closes on an agent PR — pagination on services/document-service/app/api/comments.py, then a review finding handed back as a PR comment and fixed on the same branch.
4. Backlog burn-down — triage into READY TO DELEGATE / NEEDS SPECIFICATION / HUMAN JUDGMENT, then six child sessions, six branches, six separate PRs, one ledger.
5. Event-driven leg — a .github/workflows/review-sweep.yml stale-PR sweep (cron + workflow_dispatch, per-run session cap, needs-human-review escalation) built to follow the conventions of the repo's existing sast-auto-remediate.yml, plus a Jira Ready for Dev + agent-ready transition automation with its payload spelled out.
6. Cost and capacity — ACU consumption shape per step and a delegate-vs-keep-human table. Figures are explicitly labeled illustrative.
7. What Still Needs a Human — merge approval, production access, specification, prioritization, and the fact that review depth tracks how well a repo documents its conventions.

Also updates catalog/field-kit-offerings.md demo counts, which were stale before this change:

-| 4 | **Demos** | ... | 11 (3 categories) | ...
+| 4 | **Demos** | ... | 19 (5 categories) | ...

-11 showcases across data-engineering, migration, and security.
+19 showcases across application-development, data-engineering, engineering-leadership, migration, and security.

(The tree already held 18 demos against a documented count of 11; recounted rather than incremented.)

Every repo, path, workflow filename, Makefile target, service count, and line count in the doc was verified against the referenced repos' main branches. No demos/README.md exists, so none was created.

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/66e22b9d09e841aab72aab6b0666ac84

[devin-ai-integration]

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