Enforce stricter checks on certain constants

[0xMushow]

Issue Addressed

Which issue # does this PR address?
None

Proposed Changes

All of these are performing a check, and adding a batch, or creating a new lookup, or a new query, etc..
Hence all of these limits would be off by one.

Example:

// BACKFILL_BATCH_BUFFER_SIZE = 5
  if self.batches.iter().filter(...).count() >= BACKFILL_BATCH_BUFFER_SIZE {
      return None;  // ← REJECT
  }
  // ... later adds batch via Entry::Vacant(entry).insert(...)

Without the > being changed to a >= , we would allow 6. The same idea applies to all changes proposed.

Additional Info

Please provide any additional information. For example, future considerations
or information useful for reviewers.

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