Fix make tools installing golangci-lint v1 against a v2 config

[martinlaws]

make tools installs golangci-lint from the v1 module path, but .golangci.yml is version: "2". So a clean setup following CONTRIBUTING.md breaks at the first lint:

$ make tools
$ make lint
golangci-lint run ./...
Error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2
make: *** [lint] Error 3

That also takes out make check, which CONTRIBUTING.md asks contributors to run before opening a PR.

The fix is the /v2/ module path — v1 and v2 are separate modules, so @latest on the old path keeps resolving to the last v1 release:

-	go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+	go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest

CI never hits this because it doesn't use make tools — ci.yml and test.yml both install through golangci-lint-action pinned to v2.10.1, and .mise.toml pins only Go. So the break is invisible to the project and only lands on someone setting up locally for the first time.

Verified on macOS: before the change make lint fails as above; after it, make check passes clean.

One thing you may want on top, which I've deliberately left alone: CI pins v2.10.1 while this line is @latest, currently resolving to 2.12.2. Local lint can therefore be stricter than CI. Happy to pin the Makefile to match instead — I kept @latest to stay consistent with the other installs in the target.

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Summary by cubic

Update make tools to install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest, aligning with .golangci.yml v2. This fixes clean setups where make lint failed with a v1 binary and restores make check.

^{Written for commit 317c4c6. Summary will update on new commits.}

[Copilot]

Pull request overview

Aligns the local developer tooling install path for golangci-lint with the repository’s .golangci.yml config format (v2), so fresh environments can successfully run make lint / make check after following CONTRIBUTING.md.

Changes:

• Update make tools to install golangci-lint from the /v2/ Go module path so it matches the v2 config.
• Restore clean local setup behavior where make lint previously failed due to installing a v1 binary.

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