docs(dev): document Renovate manual dispatch behavior

docs/DEVELOPMENT.md

@@ -433,6 +433,16 @@ Current workflow behavior includes:
 For details of base/complete image build strategy, see [CI/CD Multi-Stage Build Architecture](CICD_MULTI_STAGE_BUILD.md).
 For incident handling, see [CI/CD Troubleshooting](CICD_TROUBLESHOOTING_GUIDE.md).
 
+### Renovate Manual Run Behavior
+
+The Renovate workflow at `.gitea/workflows/renovate.yml` now treats manual dispatch as an explicit operator override:
+
+- when triggered via `workflow_dispatch`, it forces out-of-window execution by setting `RENOVATE_IGNORE_SCHEDULE=true`
+- it also sets `RENOVATE_SCHEDULE="at any time"` for the run
+- it executes one single pass across enabled managers instead of splitting work into multiple manager batches
+
+This keeps scheduled behavior unchanged while making manual runs deterministic and immediate.
+
 ### Operator Quick Reference
 
 Use workflow dispatch when you need deterministic reruns on a specific commit: