If a new construction house is seeded and strawed, how long before I
can predict those bald spots don't have seed? meaning I see bare spots
after 7-10 days, should I put down more seed, or have some patience?

Some weeds were on dirt when seed as put in. Thoughts on removing the
weeds? Do I risk killing the new grass planted close to the weeds?

Does straw disintegrate/ decompose or do I need to rake it? When do I
rake it?