ci: pin go 1.25.7 and use module-level go vet
- go.mod: go 1.26.5 -> 1.25.7 to match the golang:1.25 CI image (node-lookup convention) - .pre-commit-config: dnephin go-vet runs at repo root (no .go files here since both tools live under cmd/); replace with a local 'go vet ./...' hook (CI pre-commit image has go)
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