chore: update CI, DB init, and documentation

Update CI workflow, PostgreSQL init script, README, and obsidian technical docs.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

init-scripts/init-script.sql

@@ -939,6 +939,9 @@ BEGIN
 
     -- Anonymize admin notification references (not customer data — just drop the user link)
     UPDATE admin_notifications SET user_id = NULL WHERE user_id = target_id;
+
+    -- Clear login audit trail (no ongoing legal basis after account closure)
+    DELETE FROM login_audit WHERE user_id = target_id;
 END;
 $$ LANGUAGE plpgsql;
 
@@ -961,6 +964,9 @@ BEGIN
         user_id = NULL
     WHERE user_id = target_id;
 
+    -- Clear login audit trail before deleting the user row
+    DELETE FROM login_audit WHERE user_id = target_id;
+
     DELETE FROM users WHERE id = target_id AND account_role = 'guest';
 END;
 $$ LANGUAGE plpgsql;