Merge pull request #54 from strangelove-ventures/pharr117/adr-4-comet…

…bft-migration

adr(cometbft): Add ADR for Tendermint to CometBFT migration applied to wormhole-foun…

wormchain/docs/architecture/0004-tendermint-core-will-be-migrated-to-cometbft-by-bumping-to-latest-cosmos-sdk-upstream-v0-45.md

@@ -0,0 +1,33 @@
+# 4. Tendermint Core Will be Migrated to CometBFT by Bumping to Latest Cosmos SDK Upstream v0.45
+
+Date: 2024-07-12
+
+## Status
+
+Accepted
+
+## Context
+
+The Wormhole Cosmos SDK was forked at [v0.45.9](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.45.9) of the Cosmos SDK releases. This can be seen by looking at their [in-use tag's](https://github.com/wormhole-foundation/cosmos-sdk/commits/v0.45.9-wormhole-2/) last commit from the upstream [here](https://github.com/wormhole-foundation/cosmos-sdk/commit/2582f0aab7b2cbf66ade066fe570a4622cf0b098), which shares the commit history and SHA of the v0.45.9 release.
+
+This version of the Cosmos SDK was released before the fork of Tendermint Core and migration provided by the Cosmos SDK core team in the [Comet BFT](https://github.com/cometbft/cometbft) project, the motivation of which was announced [here](https://informal.systems/blog/cosmos-meet-cometbft).
+
+To facilitate a more modern usage of the Cosmos SDK, projects should move away from Tendermint Core to CometBFT, as it is more up-to-date, maintained and provides security and bug fixes.
+
+The Cosmos SDK team slowly rolled out migrations from Tendermint Core to CometBFT in the Comsos SDK repo, and this migration was implemented in the v0.45 line in release [v0.45.15](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.45.15).
+
+## Decision
+
+The migration to Tendermint Core will take place by:
+
+1. Pulling in the upstream latest version in the v0.45 line, which is [v0.45.16](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.45.16) (one version after the v0.45.15 migration release)
+2. Replaying the [commits](https://github.com/wormhole-foundation/cosmos-sdk/commits/v0.45.9-wormhole-2/?since=2022-10-19&until=2022-12-21) implemented by the Wormhole developers on top of this tag
+3. Release a new tag that includes the changes from the v0.45.16 tag and the changes made on top of it from the v0.45.9-wormhole-2 tag.
+4. Reference this new version in the wormchain go.mod file.
+
+## Consequences
+
+This change will have the following consequences:
+
+1. It pulls in the latest bug fixes and security updates in the v0.45 line while work on moving to v0.47 continues (see ADR 3 for details)
+2. It will require extensive testing and review to ensure the changes from v0.45.9 to v0.45.16 did not break the Wormchain repo's usage of the Cosmos SDK