fix: normalize schema dump commas and clean up stale OAuth sessions

Co-Authored-By: Claude Opus 4.6 <[e-mail]>

packages/hatk/src/database/db.ts

···
       sql = sql.replace(/\n\s*"(\w+)"/g, '\n$1')
       // Ensure closing paren is on its own line
       sql = sql.replace(/([^(\s])\)$/, '$1\n)')
+      // Normalize leading-comma columns added by ALTER TABLE into trailing commas
+      sql = sql.replace(/\n\s*,\s*/g, ',\n')
       // Split into lines and re-indent consistently
       const lines = sql.split('\n').map((l) => l.trim())
       sql = lines

packages/hatk/src/oauth/server.ts

···
   storeAuthCode,
   consumeAuthCode,
   storeSession,
+  deleteSession,
   checkAndStoreDpopJti,
   cleanupExpiredOAuth,
   storeRefreshToken,
···
       did: session.did,
       pds_endpoint: session.pds_endpoint,
     })
+    await deleteSession(session.did)
     return null
   }