We can’t say we weren’t worried. Watching building disrepair and funding battles, scrapped additions and ousted leaders, many of us wondered if the Corcoran Gallery of Art would ever bounce back from its troubles. On the contrary, it seems the Corcoran may have entered a bright new era. The Post followed around new Director Paul Greenhalgh and published a thorough report on the gallery’s new vision. Greenhalgh’s enthusiasm is infectious as he describes his first…