FIP-0118 specification completion

## Done Criteria
FIP-0118 is accepted and has all the relevant items learned from implementation incorporated back.

## Purpose of this issue
Tracke the various things that need to role back into the FIP so we don't lose track of anything.

## Remaining Items
- [x] https://github.com/filecoin-project/FIPs/pull/1277
- [x] Quarter determinism as discussed in https://github.com/filecoin-project/solstice/issues/7
- [x] Dispute window for `UpgradeSectorQuality`
- [x] https://github.com/filecoin-project/FIPs/pull/1279
- [x] [Define EPOCHS_PER_QUARTER](https://github.com/filecoin-project/solstice/issues/31#issuecomment-5475553644)
- [ ] Preactivation section in https://github.com/filecoin-project/FIPs/blob/irenegia/0118-last-call-clarifications/FIPS/fip-0118.md#todo
- [x] [Window-overlap constraint: POST_PERIOD + VERIFICATION_WINDOW < EPOCHS_PER_QUARTER](https://github.com/filecoin-project/solstice/issues/31#issuecomment-5475055170)
- [x] "FIP text edits" listed in https://github.com/filecoin-project/solstice/issues/39