fix(table): dispatcher cursor starts at -1 so position 0 is included

The dispatcher's row-window SELECT is `position > cursor` for exclusive
lower-bound semantics. With cursor initialized to 0, position-0 rows were
never picked up — every dispatch silently skipped the table's first row.

Start cursor at -1 instead. First window's filter `position > -1` matches
position 0; subsequent iterations advance to `lastPosition` which then
correctly excludes already-processed rows.

Author: TheodoreSpeaks

apps/sim/lib/table/dispatcher.ts

@@ -119,7 +119,10 @@ export async function insertDispatch(input: {
     mode: input.mode,
     scope: input.scope,
     status: 'pending',
-    cursor: 0,
+    // -1 = "haven't started." First window's filter `position > -1` matches
+    // position 0; subsequent iterations advance to `lastPosition` which then
+    // correctly excludes already-processed rows.
+    cursor: -1,
     isManualRun: input.isManualRun,
   })
   return id