Initial public commit

Daybook: a self-hosted, multi-user Django + DRF app where agents, scripts,
or people publish artifacts and each logged-in user browses their own
time-ordered, label-filterable feed.

This squashes prior local development history (kept privately on a separate
branch) into a single clean starting point for the public repository.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

artifacts/migrations/0004_rename_persona_to_source.py

@@ -0,0 +1,16 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("artifacts", "0003_tagcolor"),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name="artifact",
+            old_name="persona",
+            new_name="source",
+        ),
+    ]