fix(save): detect comment edits with a rendered-Org hash, not the md round-trip

A comment whose markdown doesn't survive md->org->md (a heading, single-asterisk italics) was flagged changed on every save, because the dirty scan compared org-to-md of the rendered body against the stored markdown hash. When the comment was authored by someone else, that surfaced as "1 read-only comment skipped" on every save even though nothing had been edited.

Descriptions already dodge this: 9424b84 gave them LINEAR-DESC-ORG-SHA256 and compared Org-to-Org. I did the same for comments. pearl--format-comment now writes LINEAR-COMMENT-ORG-SHA256 (the rendered body hash), and a new pearl--comment-dirty-p compares the current body against it, falling back to the old markdown hash for comments rendered before the baseline existed. Both detection sites use it: the save scan and the edit-current-comment no-op check. The markdown hash stays for the remote-conflict gate.

0 files changed, 0 insertions, 0 deletions