feat: update release notes

Signed-off-by: Mohammad Tayyab <[email protected]>

Author: Mohammad-Tayyab-Frequenz

RELEASE_NOTES.md

@@ -9,12 +9,15 @@
 <!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
 
 - The minimum supported version of `matplotlib` is now `v3.9.2`.
+- Add `src/frequenz/lib/notebooks/reporting/schema_mapping.yaml` to your deployment so notebooks can load the canonical column definitions via `ColumnMapper`.
 
 ## New Features
 
 <!-- Here goes the main new features and examples or instructions on how to use them -->
 
-- This release supports python 3.13.
+- Introduced `frequenz.lib.notebooks.reporting.metrics.reporting_metrics` with first-class definitions for production excess, battery charging share, grid feed-in, self-consumption, self-consumption share, and inferred consumption; the schema now documents each metric via an `implementation` tag.
+- Added `frequenz.lib.notebooks.reporting.utils.helpers.add_energy_flows()` (plus supporting helpers) that aggregates raw production/consumption columns and appends the derived flows the reporting notebook needs.
+- Published a locale-aware `ColumnMapper` utility that reads the YAML schema so notebooks can seamlessly move between raw API headers, canonical identifiers, and localized display labels.
 
 ## Bug Fixes