Opens the row's backing .yaml in the browse tool's YAML editor
(preview-yaml.js — CodeMirror with syntax highlight, lint, Ctrl+S
save). Disabled on multi-row range and unsaved draft rows.
Three URL shapes resolve correctly:
per-party row → <dir>/?file=<file>.yaml
SSR virtual → /<project>/archive/<party>/?file=ssr.yaml
rollup virtual → /<project>/archive/<party>/<slot>/?file=<file>.yaml
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>