fix(mod): declare /v2 module path for Go SIV

[autholykos]

Blocker

Go's Semantic Import Versioning (mandatory since Go 1.11 for modules with a go.mod) requires the module path for v2+ to carry a /v2 suffix. We tagged v2.0.0 at commit a375e69 with module github.com/dusk-network/stroma — no suffix. The Go proxy rejects it:

$ curl -s https://sum.golang.org/lookup/github.com/dusk-network/stroma@v2.0.0
not found: github.com/dusk-network/stroma@v2.0.0: invalid version:
  module contains a go.mod file, so module path must match major version
  ("github.com/dusk-network/stroma/v2")

So v2.0.0 is currently unconsumable by any Go toolchain. Consumer repos (Hippocampus, Pituitary) cannot go get it at all.

Fix

• go.mod: module github.com/dusk-network/stroma → …/v2
• Rewrite every internal import of github.com/dusk-network/stroma/X → .../v2/X (11 .go files, 31 import sites across chunk, index)

Pure mechanical rewrite — no behavior change.

Retag plan

After this lands, v2.0.0 will be retagged in place at the post-fix HEAD. Retagging is safe because proxy.golang.org never cached the broken tag:

$ curl -sI https://proxy.golang.org/github.com/dusk-network/stroma/@v/v2.0.0.info
HTTP/2 404
$ curl -sI https://proxy.golang.org/github.com/dusk-network/stroma/v2/@v/v2.0.0.info
HTTP/2 404

SIV rejected the proxy fetch before any checksum could be cached, so no downstream consumer has a frozen hash to collide with.

Test plan

• go build ./... clean
• go vet ./... clean
• gofmt -l . empty
• go test ./... — all five packages pass under the new module path
• CI analyzers + go + macos jobs green
• After merge: delete existing v2.0.0 tag + GitHub release, retag v2.0.0 at new HEAD, recreate release with same notes, sanity-check go get github.com/dusk-network/stroma/v2@v2.0.0 from a scratch dir

[Copilot]

Pull request overview

Updates the repository to comply with Go Semantic Import Versioning for v2+ so that v2.0.0 is consumable via the Go module proxy and standard go tooling.

Changes:

• Change module path in go.mod to github.com/dusk-network/stroma/v2.
• Rewrite internal imports across chunk and index packages (including tests/benchmarks) to use the /v2-suffixed module path.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go.mod	Declares the /v2 module path required for SIV.
chunk/policy.go	Updates corpus import to /v2 path.
chunk/policy_test.go	Updates corpus import to /v2 path.
index/index.go	Updates internal imports (chunk, corpus, embed, store) to /v2.
index/snapshot.go	Updates internal imports (corpus, store) to /v2.
index/reuse.go	Updates internal imports (chunk, corpus, store) to /v2.
index/context_test.go	Updates internal imports (corpus, embed, store) to /v2.
index/fusion_test.go	Updates internal imports (corpus, embed, store) to /v2.
index/index_test.go	Updates internal imports (chunk, corpus, embed, store) to /v2.
index/policy_test.go	Updates internal imports (chunk, corpus, embed, store) to /v2.
index/reuse_bench_test.go	Updates internal imports (corpus, embed, store) to /v2.
index/reuse_scan_test.go	Updates internal imports (corpus, embed, store) to /v2.

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