Include long-form tweet fields in read shortcut

[jack4452]

Summary

This updates the xurl read shortcut to request X's long-form post fields:

• note_tweet
• article

X can return a shortened legacy/preview value in data.text for Premium long-form posts, while the full rendered body is available in data.note_tweet.text (or, for article-style posts, data.article). Without requesting those fields, xurl read can make a valid long post look truncated to CLI users and automation.

Why

We hit this with a Premium account posting a long-form podcast announcement. The post rendered correctly on x.com, but the API response from xurl post / xurl read only showed the shortened data.text preview. A raw request with tweet.fields=note_tweet,article returned the full body under data.note_tweet.text.

Requesting these fields by default keeps the existing JSON shape intact and simply exposes the additional long-form payload when X returns it.

Changes

• Adds note_tweet,article to the tweet.fields used by ReadPost.
• Updates the shortcut test server to require those fields for read requests.
• Extends TestReadPost to assert that a note_tweet.text payload is preserved in the returned JSON.

Test plan

• gofmt -w api/shortcuts.go api/shortcuts_test.go
• go test ./...
• go build ./...
• Manually verified against the X API that requesting tweet.fields=note_tweet,article returns the full long-form post body in data.note_tweet.text for a real Premium long post while data.text remains shortened.

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