chore: update serena project configuration

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

Author: jerome-benoit

.serena/project.yml

@@ -14,10 +14,10 @@
 # The first language is the default language and the respective language server will be used as a fallback.
 # Note that when using the JetBrains backend, language servers are not used and this list is correspondingly ignored.
 languages:
-  - typescript
+- typescript
 
-  # the encoding used by text files in the project
-  # For a list of possible encodings, see https://docs.python.org/3.11/library/codecs.html#standard-encodings
+# the encoding used by text files in the project
+# For a list of possible encodings, see https://docs.python.org/3.11/library/codecs.html#standard-encodings
 encoding: 'utf-8'
 
 # whether to use the project's gitignore file to ignore files
@@ -107,3 +107,10 @@ fixed_tools: []
 # override of the corresponding setting in serena_config.yml, see the documentation there.
 # If null or missing, the value from the global config is used.
 symbol_info_budget:
+
+# The language backend to use for this project.
+# If not set, the global setting from serena_config.yml is used.
+# Valid values: LSP, JetBrains
+# Note: the backend is fixed at startup. If a project with a different backend
+# is activated post-init, an error will be returned.
+language_backend: