refactor(#1283): T3 — migrate 9 multi-leaf callers off the core spine (batch 2) (#1285)

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>

scripts/lint-core-spine-imports.allowlist.json

@@ -5,19 +5,10 @@
     "src/audit-command-router.cts",
     "src/check-command-router.cts",
     "src/commands.cts",
-    "src/config.cts",
-    "src/docs.cts",
-    "src/gap-checker.cts",
-    "src/graphify-command-router.cts",
-    "src/init.cts",
     "src/intel-command-router.cts",
     "src/phase.cts",
-    "src/profile-output.cts",
     "src/roadmap.cts",
     "src/state.cts",
-    "src/template.cts",
-    "src/uat.cts",
-    "src/verification.cts",
-    "src/workstream.cts"
+    "src/template.cts"
   ]
 }