[Core] Make post-load publication warm-only

Close publication leases inside Host Weight Runtime, return only the publication report, and cover the new terminal mappings. Rename the runtime test module to avoid the pytest basename collision reported in #6436.

Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com>

docs/design/module/host_weight_runtime.md

@@ -150,11 +150,10 @@ only after the canonical loader has established the current model.
 Post-load publication is synchronous in V1, but its outcome is independent of
 the already completed resolution. A store failure is returned in a separate
 publication report and cannot turn a valid canonical model into a failed
-resolution. On success, ownership of the validated lease transfers to the
-caller. The caller may close it after warming the store, or use a restorer to
-rebind a model that has not entered service so the current process can also use
-the shared mmap backing. Model mutation and lease teardown remain loader and
-transport responsibilities.
+resolution. On success, the runtime closes the validated store lease before
+returning the report. Post-load publication only warms future startups; it does
+not restore, rebind, or otherwise mutate the canonically loaded model serving
+the current startup.
 
 ## Restoration transaction boundary