feat(examples): make the feed reader the end-to-end services showcase

[ctate]

Reworks examples/service-feed-reader into the canonical demonstration of the full services loop: fetch → service parse → typed record → model update → recorded replay.

• The core issues Cmd.fetch for feed bytes (a checked-in fixture serves tests and offline runs, so no test touches the network) and hands them to the service through the generated @native-sdk/services client — the example previously called its service with raw Cmd.request bytes.
• Request and result are contract-encodable records declared once in src/shared.ts; the service does real parsing with the static tier and returns typed items the markup renders.
• Replay is proven, not claimed: a new battery (tests/ts-services/feed_reader_e2e_tests.zig, wired into the ts-services and ts-core e2e steps) records a session through fetch delivery and service results, then replays it byte-identically with the service never running.
• The example README walks the loop; the services chapter and packages page point at this example.

Example suite, ts-services e2e, docs check, and the gate pass; the only failure is the pre-existing toggle-big-view render-budget case.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
native-sdk	Ready	Preview	Aug 14, 2026 3:07am