docs: pin golangci-lint version to match ci (#135)

the lint steps said `golangci-lint run` with no version. ci pins
v2.11.4 and .golangci.yml is a v2 config tuned for it, so a contributor
on another version gets spurious findings from unrelated linters.
document the pinned invocation in both the dev guide and the readme so
local runs match ci.

fixes #65

README.md

@@ -365,7 +365,7 @@ contributions welcome. see [contributing.md](CONTRIBUTING.md) for guidelines.
 gofmt -w .
 
 # lint
-golangci-lint run
+go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.11.4 run
 
 # test
 go test ./...

docs/development.md

@@ -60,8 +60,11 @@ gofmt -w .
 
 ### lint
 
+ci pins golangci-lint v2.11.4 (`.github/workflows/go.yml`); other versions
+report spurious issues against the v2 config, so pin it locally too:
+
 ```bash
-golangci-lint run
+go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.11.4 run
 ```
 
 ### test
@@ -164,7 +167,7 @@ go test -tags=integration ./internal/scan/...
 1. fork the repository
 2. create a feature branch
 3. make changes
-4. run `gofmt -w .` and `golangci-lint run`
+4. run `gofmt -w .` and `golangci-lint run` (pinned version, see [lint](#lint))
 5. submit pr
 
 ### commit messages