docs(view-sync): README sync-up section + spec status to Done

This is Phase 6 of docs/saved-query-sync-spec.org, the docs commit that lands the saved-query → Linear view sync work.

I added a new "Publishing a saved query as a Linear view" subsection under Commands → Sources. It walks through the two publish commands (sync-saved-query-to-linear and publish-current-source) with their full bindings, the scope-and-visibility prompt the user sees on first sync, the Replace/Rename/Cancel collision flow, the four :linear-view-* metadata keys + :linear-view-url that get persisted, the one-way push semantics, the v1 caveat that :sort and :order don't sync up, and the two-stage delete-saved-query prompt for synced entries.

I updated the existing Sources example block to include the new [saved → <scope>] picker labels (team-scoped, Personal, and the stale-team `?` case), with a paragraph explaining how the dispatch routes those through customView(id:) on Linear rather than re-running the local filter.

I extended the prefix-keymap quick-reference table with f S (sync), f P (publish), and k q (delete saved query) because they were bound in pearl-mode but missing from the table. The Fetching and refreshing command table gained rows for sync-saved-query, publish-current-source, and delete-saved-query.

I flipped docs/saved-query-sync-spec.org Status from Ready to Done with the four implementation-phase commit hashes (60a026b, c8b9ad1, fd94237, 0975e7d).

No code changes. 660 ert tests still green. make compile and make lint clean.

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