Migrate 9 files' entire core surface to the leaf modules directly
(behaviour-identical — leaves are the objects core re-exports by reference):
config, docs, gap-checker, graphify-command-router (namespace core.output ->
io.output), init (17 core symbols -> 8 leaves), profile-output, uat,
verification, workstream.
All 9 now import zero core symbols and are removed from the allowlist
(18 -> 9). Stale core.* docstrings corrected. core.cts re-exports untouched
(still serve the remaining 9 files); teardown is T-final. No behaviour change.
Closes#1283
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
ec2ecdf28b