* feat(ui): prototype observed engineering ROI dashboard
* feat(roi): replace effort estimates with measured repository metrics
* fix(roi): finish connection recovery and generated API contracts
* fix(roi): show merged changes before accounts are linked
* fix(roi): preserve selected report tab across refreshes
* fix(roi): recover app authorization and keep detail values readable
* fix(roi): reuse the shared OAuth HTTP client
* feat(roi): combine providers and compare equal reporting periods
* docs: explain ROI metrics for first-time readers
* fix(roi): preserve connections and scheduled reports during setup
* ci(roi): assign database contracts to the active Postgres shard
* fix(roi): preserve issue counts and normalized connections
* fix(ui): compact ROI dashboard header and metrics
* fix(ui): show ROI repository count with expandable list
* fix(ui): wrap ROI controls within narrow panels
* fix(roi): restore sample report preview and simplify setup
