feat: add the unified ticket save model with save-issue and save-all

Editing a ticket meant remembering which per-field command to run: pearl-sync-current-issue for the description, pearl-sync-current-issue-title for the heading, pearl-edit-current-comment for a comment. Three fields, three commands, and no single way to edit several fields (or several tickets) and push them at once.

I added a layered save engine and two commands over it. pearl--run-field-save does the fetch, the three-way conflict gate, and the push for one field, emitting a single structured outcome instead of messaging from its callback. The three interactive sync commands are now thin wrappers over the per-field savers, so they keep working and gain the outcome. pearl-save-issue diffs the ticket at point and pushes only what changed. pearl-save-all scans the whole file, confirms once naming the field counts, and saves every diff in a sequential pass that continues past a per-ticket conflict. A queue runner keeps at most one conflict-resolution buffer live at a time.

I also fixed a correctness bug: a description push now advances both LINEAR-DESC-SHA256 (the markdown the remote gate hashes against) and LINEAR-DESC-ORG-SHA256 (the rendered-Org baseline the local scan uses). Advancing only the markdown hash left the Org hash stale, so the next local scan would flag a just-saved ticket as dirty again.

The conflict resolver gained an optional outcome callback so the engine can report cancel, use-local, use-remote, and the deferred smerge commit or abort as distinct outcomes. I removed the now-dead pearl--commit-sync-decision. The keybinding scheme and the transient menu retarget are a separate follow-up.

Spec: docs/ticket-save-model-spec.org.

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