Module hardfork 

Tempo-specific hardfork definitions and traits.

This module provides the infrastructure for managing hardfork transitions in Tempo.

Adding a New Hardfork

When a new hardfork is needed (e.g., Vivace):

In hardfork.rs:

1. Add a new variant to TempoHardfork enum
2. Add is_vivace() method to TempoHardfork impl
3. Add is_vivace_active_at_timestamp() to TempoHardforks trait
4. Update tempo_hardfork_at() to check for the new hardfork first (latest hardfork is checked first)
5. Add TempoHardfork::Vivace => Self::OSAKA (or appropriate SpecId) in From<TempoHardfork> for SpecId
6. Update From<SpecId> for TempoHardfork to check for the new hardfork first
7. Add test test_is_vivace and update existing is_* tests to include the new variant

In spec.rs:

8. Add vivace_time: Option<u64> field to TempoGenesisInfo
9. Extract vivace_time in TempoChainSpec::from_genesis
10. Add (TempoHardfork::Vivace, vivace_time) to tempo_forks vec
11. Update tests to include "vivaceTime": <timestamp> in genesis JSON

In genesis files and generator:

12. Add "vivaceTime": 0 to genesis/dev.json
13. Add vivace_time: Option<u64> arg to xtask/src/genesis_args.rs
14. Add insertion of "vivaceTime" to chain_config.extra_fields

Current State

The Adagio variant is a placeholder representing the pre-hardfork baseline.

Enums

TempoHardfork

Tempo-specific hardforks for network upgrades.

Traits

TempoHardforks

Trait for querying Tempo-specific hardfork activations.