* Add dependency-review caller workflow
Add a pull_request-triggered caller that invokes the org-level
callable-dependency-review workflow to scan dependency changes and
fail on high-severity advisories.
* chore: retrigger checks
* chore: retrigger dep review (post-fix)
* style: ruff format src
Consolidates front-sla-monitor (Python SAM) and google-user-sync
(JavaScript CDK) into a single Python SAM repo with two Lambdas:
front-sla-monitor and front-user-sync.
