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/0008_artifact_read_at.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.15 on 2026-07-23 21:52
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('artifacts', '0007_owner_required'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='artifact',
+            name='read_at',
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+    ]