Development record

commands/lint.md documented repolint JSON findings as carrying 'a file and line (line 0 means the finding is not tied to one line)', but repolint.go tags Line as json:line,omitempty so a zero line is omitted entirely, never emitted as 0. Line-less findings are the majority (only docs-currency/privacy-hygiene/identity-positioning set Line). An agent following the doc and testing line==0, or formatting file:line, produces file:undefined. The brief 16-lint.md carries the true contract but named only two line-carrying rules, omitting identity-positioning (rule_positioning.go also sets Line). commands/prepare-this-repo.md implied the same line sentinel.