feat: upgrade to sdk v0.55

[julienrbrt]

Description

Upgrades Ignite CLI and the scaffolded Cosmos SDK chain templates to Cosmos SDK v0.55.0, IBC-Go v11.2.0, and CometBFT v0.40.0.

CLI

• Bump github.com/cosmos/cosmos-sdk to v0.55.0, github.com/cometbft/cometbft to v0.40.0, and cosmossdk.io/core to v1.1.0.
• Bump github.com/libp2p/go-libp2p to v0.50.0 and github.com/quic-go/webtransport-go to v0.13.0. CometBFT v0.40 pulls in libp2p, and webtransport-go v0.11.1 does not compile against the quic-go version required by the buf tool.
• Add StargateFiftyFiveVersion to cosmosver.Versions (now Latest).
• Update the scaffolded app (plugin) template: pin Cosmos SDK v0.55.0, raise the Go directive to 1.26.7, and pin libp2p v0.50.0 and webtransport-go v0.13.0. The old v0.53.6 pin breaks go mod tidy now that cosmossdk.io/api v1.1.0 drops the params and group proto packages, and the webtransport pin is needed until ignite/cli main carries the compatible versions.
• Resolve SDK module protos from the SDK proto directory only during module discovery. Cosmos SDK v0.55 moves the deprecated circuit and nft protos to contrib/proto, outside the proto tree, where buf --path cannot reach them and the name-based package lookup returns missing paths.

Chain template

• Update go.mod: SDK v0.55.0 dependency set, go 1.26.5, and replaces for sonic, libp2p, and webtransport-go.
• Remove x/params (deleted in v0.55): drop the params module config, ParamsKeeper, GetSubspace, and the legacy IBC param key tables.
• Remove x/circuit and x/nft from the template, following the SDK v0.55 reference app (simapp). They are deprecated and moved to cosmos-sdk/contrib, and TypeScript client generation cannot resolve their protos from the contrib tree.
• Remove x/group (moved to Cosmos Enterprise under a commercial license).
• Move evidence, feegrant, and upgrade imports to github.com/cosmos/cosmos-sdk/x/....
• Move cosmossdk.io/log to log/v2 and cosmossdk.io/store to cosmos-sdk/store/v2.
• Remove the SIGN_MODE_TEXTUAL wiring from root.go (TextualCoinMetadataQueryFn is gone in v0.55).
• Add the staking key rotation fee pool module account and put bank first in the end blockers, both required by v0.55.
• Drop traceStore from app.New, AppCreator, AppExporter, and appBuilder.Build.
• Migrate the IBC wiring to v11: keeper constructors lose the subspace argument, the transfer keeper takes an address codec, keepers are held as pointers, and scaffolded IBC modules implement SetICS4Wrapper.
• Replace NewUncachedContext with NewNextBlockContext plus SimWriteState in the in-place testnet command.
• Use the new genutil.ExportGenesisFileWithTime signature in the multi-node testnet command.

Template bug fixes found along the way

• expected_keepers.go imported cosmossdk.io/core/address only when the module had a Staking dependency, but AuthKeeper always uses address.Codec. Modules without a Staking dependency did not compile. The import is now unconditional.
• depinject.go had an unbalanced plush conditional that rendered the ibckeeper import into non-IBC modules. The opening conditional is restored.
• The module keeper test templates imported log and codectestutil without using them.

Docs

• Add the Cosmos SDK v0.55 section to the v30.0.0 migration guide.
• Update the readme compatibility table, the install Go version requirement, the Go client tutorial module example, and the IBC guide import.
• Prefix Cosmos commands with ignite cosmos in the live guide, clients, and configuration pages, since the top-level commands now target gno.land.
• Add changelog entries.

Validation

• go build ./... and go vet ./... pass.
• Scaffolded fresh chains (standard and minimal), then IBC module, packet, message, list, and map scaffolds on top. All compile and vet clean.
• ignite cosmos chain init and ignite cosmos chain serve run on a freshly scaffolded chain and the chain produces blocks.
• ignite cosmos generate ts-client and generate composables (with a Vue frontend) work on a freshly scaffolded chain.
• Integration suites chain, app, tx, and cosmosgen pass. Local runs need a workaround for an invalid Buf API token in the machine ~/.netrc and for a goenv test that assumes the default GOMODCACHE path; CI is not affected by either.

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