It looks like two separate plugins for Jetbrains IDE's sort of cover the gist of your comments wishlist (I haven't tried these, I'm just reporting what their blurbs say): "The Better Comments plugin will help you create more human-friendly comments in your code.…" and "[Code comments plugin lets you] Add comments to code of project without change (sic) it."
RubyMine, and presumably all the Jetbrains IDE's, can show version control history for the selected lines (I haven't tried, and doubt would work, selecting a substring of a single line and asking for its history). That view gives a Git commit hash (I don't know what it does for other VCS's, as I don't use them). Linking to the commit and PR's isn't built in. Maybe somebody wrote a plugin for that.
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It looks like two separate plugins for Jetbrains IDE's sort of cover the gist of your comments wishlist (I haven't tried these, I'm just reporting what their blurbs say): "The Better Comments plugin will help you create more human-friendly comments in your code.…" and "[Code comments plugin lets you] Add comments to code of project without change (sic) it."
RubyMine, and presumably all the Jetbrains IDE's, can show version control history for the selected lines (I haven't tried, and doubt would work, selecting a substring of a single line and asking for its history). That view gives a Git commit hash (I don't know what it does for other VCS's, as I don't use them). Linking to the commit and PR's isn't built in. Maybe somebody wrote a plugin for that.