feat(comments): fetch an issue's full comment thread

pearl-fetch-all-comments pages the whole comment connection for the issue at point and replaces its Comments subtree with the complete set. It's bound to C-; L f c and in the transient. The bulk list and view fetch showed only the newest pearl-list-comments-shown comments with an N/M+ overflow marker, so anything past the cap couldn't surface in the buffer.

The replacement is surgical: pearl--replace-comments-subtree swaps only the Comments subtree, so the issue title, drawer, and description body keep any unsaved edits, and the new heading carries an exact N/N count. It refuses when the issue has unpushed comment edits (reusing the save model's dirty scanner) so the fetch can't clobber an unsent change.

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