Squashed 'l2/' content from commit 79caa24

git-subtree-dir: l2
git-subtree-split: 79caa24e2129bf6e2cee819327d5622425306b67

.env.example

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+# L2 Server Configuration
+
+# PostgreSQL password (REQUIRED - no default)
+POSTGRES_PASSWORD=changeme-generate-with-openssl-rand-hex-16
+
+# Domain for this ActivityPub server
+ARTDAG_DOMAIN=artdag.rose-ash.com
+
+# JWT secret for token signing (generate with: openssl rand -hex 32)
+JWT_SECRET=your-secret-here-generate-with-openssl-rand-hex-32
+
+# L1 server URL for fetching content (images/videos)
+L1_PUBLIC_URL=https://celery-artdag.rose-ash.com
+
+# Effects repository URL for linking to effect source code
+EFFECTS_REPO_URL=https://git.rose-ash.com/art-dag/effects
+
+# Notes:
+# - ARTDAG_USER removed - now multi-actor, each registered user is their own actor
+# - L1 URL can also come from provenance data per-asset