Chalk it up as another win for the Navy’s band of botanists. Two rare and long-imperiled plants that subsist only on San Clemente Island are returning from the brink of extinction after decades under the threat of bombs, shelling, SEAL raiders and especially feral goats. The San Clemente Island lotus and paintbrush are numerous enough that the Fish and Wildlife Service downgraded their status from endangered to threatened in a July 25 announcement, which credited the Navy for their comeback. San Clemente, the most southern of the Channel Islands off southern California, is an uninhabited and oft-bombarded isle used in…