chore(makefile): fix tab indent and add make -n pre-commit guard

The deploy-migrate recipe was indented with 8 spaces instead of a
tab, which would fail at parse time the next time the target ran.
The new make -n pre-commit hook catches this class of parse error
locally before it can land.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: rtibbles

.pre-commit-config.yaml

@@ -81,6 +81,15 @@ repos:
           contentcuration/kolibri_public/migrations/0004_auto_20240612_1847.py|
           contentcuration/kolibri_public/migrations/0006_auto_20250417_1516.py|
           )$
+  # Only checks the root Makefile. Extend if nested Makefiles get added.
+  - repo: local
+    hooks:
+      - id: makefile-syntax
+        name: Makefile syntax check
+        entry: make -n
+        language: system
+        files: ^Makefile$
+        pass_filenames: false
   # Always keep black as the final hook so it reformats any other reformatting.
   - repo: https://github.com/python/black
     rev: 20.8b1

Makefile

@@ -39,7 +39,7 @@ migrate:
 # 4) Remove the management command from this `deploy-migrate` recipe
 # 5) Repeat!
 deploy-migrate:
-        echo "Nothing to do here!"
+	echo "Nothing to do here!"
 
 contentnodegc:
 	python contentcuration/manage.py garbage_collect