The Workflow section still told contributors to branch from `main` and
merge there. Rewrite it to the current model: branch per issue from
`next`, PR based on `next`, an independent reviewer gates it, the
manager squash-merges into `next`, and only the owner merges `next`
into `main` via the milestone PR. Update the Status paragraph so it no
longer says work is green on `main`, and record that the `1.0.0`
milestone is in progress with `next` at the canonical golangci-lint
v2.12.2 config. Docs-only; the rest of the file is left unreflowed
(that is issue 100).
Model: opus-4-8