Bryan,
Most architect contracts call for using a "professional standard of care" to assure designs function. That said, it would be easy for any defendant architect to show others used a similar standard, or lower. When you have some of the top guys in the business designing some of the hardest to maintain golf courses, it would be hard to make claims on that standard.
Contractors usually provide a one year guaranteed against workmanship defects, trench settling, etc. Sometimes, parts of the guarantee extend to two years, and in other cases, usually turf growth and grow in, the guarantee doesn't apply, providing the contractor provides viable seed and sod. They would have no responsibility for small tees, as that is a design issue, unless they didn't follow the plans against the architects orders.
As to those design issues, I think most architects provide a design program, and the owner should understand that you are aiming for 6000 SF tees and greens (of course, greens have more variety, and par 3 tees should be larger, etc.) And, in most cases, shaping is approved as they go as a formal part of the construction process. It is presumed that the architect and owners rep review for conformance to basic design specs before both approve.
The formality of the process varies all over the map, usually depending on the people relationships on the job. The owner's rep may be in awe of the architect (well, its never happened to me, but.....) or respectful that design is design. If that is the superintendent, they usually push for as maintenance friendly design as possible, but some are hesitant to confront the architect.
I had one who never said a thing, but I received one of his "cover my ass" memos from him by mistake. While he never said a word during the design process, it turns out he wrote "memos for the file" that basically said that about everything about the design and construction was below his standards, and of course, he couldn't be blamed for any maintenance issues with the crap he was dealing with. IMHO< that wasn't the most constructive approach......That is rare, but an example of the extremes of the process.
On the other end of it, I am also aware of a long ago case where a semi-rookie architect designed tees at about 2500 SF instead of 6000 SF, and somewhere over the winter he learned somewhere what a proper size should be. The next spring, he "Un-approved" several tees he had previously approved because "the contractor built them too small" while the contractor argued that he built them to plan and they were approved in the field. From memory, the contractor absorbed the cost of the rebuild, but contractually, they probably didn't need to.
Just some more "tales from the front line."