docs: supersede the keyword spec's sync-back half with save-model-v2

The spec predates save-model-v2, which removed the org-sync push path its "sync-back: cycled keyword → Linear state" section relied on. Mark that section obsolete: state now reconciles at save through pearl--save-state-field, and the cycled-keyword → state-id resolution is the c8 task. Record the invariant c8 leans on — every fresh render sets the keyword to slugify(state-name) — and the one stale-render caveat a refresh closes.

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