build(ci): release v1.6.2 — staticcheck in task ci, SA4006 fix

Add go tool staticcheck ./... to the task ci pipeline (between vet and
test), consistent with the Gitea CI workflow. Fix the SA4006 it surfaced
in TestLatestTagTagsIterFails where err from PlainOpen was assigned but
never read before being overwritten.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -3,6 +3,16 @@
 All notable changes to this project will be documented in this file.
 Format: [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [1.6.2] - 2026-07-11
+
+### Changed
+
+- **`task ci` now runs `go tool staticcheck ./...`** — runs between `go vet` and `go test`; matches the step already present in the Gitea CI workflow
+
+### Fixed
+
+- **SA4006 in `TestLatestTagTagsIterFails`** — `err` from `gogit.PlainOpen` was assigned then immediately overwritten without being read; added the missing `if err != nil { t.Fatalf(...) }` check
+
 ## [1.6.1] - 2026-07-11
 
 ### Fixed