These are generally good answers, solid writing. A couple points that may make wording more accurate:
Pretty sure this is correct, though remember at one point in time we had a ‘manual mode’ plugin that did allow you do arbitrarily change a node’s score. Presumably refactored out by now.
This is a good answer, but just to nitpick, “signal their appreciation of it with likes or emojis (depending on the platform)” isn’t exactly accurate, at least not all the time. Right now, we only mint Cred on likes for the Discoruse plugin, and emojis for the Discord plugin. However, for the GitHub plugin, we mint on merged PRs and reviews on merged PRs. And, a community can (and very well might in the future) change the weights such that Cred is minted on raw activity; indeed, the way we “hacked” minting only on like in the Discourse plugin is by setting the other weights to 0. Generally speaking, I would say the the community signals their appreciation by engaging with the contribution, such as with likes and emojis (which are a specific type of engagement that implies some kind of review/value judgement, as opposed to raw activity (e.g. responded to).