fix(slack): autoload w/@/# commands, guard close-all, register the prefix

Three lifecycle gaps that bit before slack loads. The w / @ / # keys bound slack-message-write-another-buffer, slack-message-embed-mention, and slack-message-embed-channel, none autoloaded or in :commands, so they void-function'd before slack started; added them to :commands. cj/slack-close-all-buffers read slack-current-buffer via buffer-local-value on every buffer, which signals void-variable on buffers without the local binding; it now guards with buffer-local-boundp like its sibling. And C-; S was bound with a raw global-set-key, invisible to the keybindings registry; it now registers through cj/register-prefix-map like the signal and erc prefixes.

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