feat: add the local dirty scanners for the ticket save model

First layer of the unified save model (docs/ticket-save-model-spec.org). pearl--issue-dirty-fields returns which of title, description, and comment candidates changed in the issue subtree at point, with no network call. Description dirtiness reuses pearl--subtree-dirty-p, which hashes the rendered Org against LINEAR-DESC-ORG-SHA256, so a description whose markdown is lossy under org->md isn't falsely flagged. Comment candidates hash org->md of each body against LINEAR-COMMENT-SHA256, matching how pearl-edit-current-comment computes its no-op check.

Ownership is a separate phase: pearl--classify-comment-candidates splits candidates into own versus read-only once the viewer id is known, since the local scan can't tell who authored a comment without it. The save-issue and save-all commands that consume these scanners land in the next layers.

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