[UPD] gitignore : tasks/ et .erplibre-state.json

tasks/ porte les notes de travail que la convention garde hors du dépôt, et
.erplibre-state.json l'état de ce qu'un checkout a installé, écrit par
erplibre_state.py. Non ignorés, un « git add -A » les emportait.

--- EN ---

tasks/ holds the working notes the convention keeps out of the repository,
and .erplibre-state.json the state of what a checkout has installed, written
by erplibre_state.py. Left unignored, a "git add -A" swept them in.

Assisted-by: Claude Opus 5

.gitignore

@@ -38,6 +38,8 @@ manifest/default.dev.xml
 poetry.lock
 pyproject.toml
 .erplibre-semver-version
+# State of what this checkout has installed.
+.erplibre-state.json
 .erplibre-version
 .odoo-version
 .poetry-version
@@ -50,3 +52,6 @@ screencasts
 private/todo/todo_override_private.json
 .erplibre.error.txt
 /mobile/erplibre_home_mobile/
+
+# Working notes, kept out of tracked files by the code conventions.
+tasks/