fix(server): drain queued native child continuations#21461

test(server): preserve pending descendants after child transfer

Merge ancestor snapshot correction from dependency

fix(opencode): refresh ancestor snapshots after wake replay

Merge updated pending snapshot dependency

fix(server): a transferred child's pending snapshot no longer pins the prior run

Merge remote-tracking branch 'origin/main' into HEAD

Merge remote-tracking branch 'origin/takeover/opencode-pending-snapshots' into HEAD

fix(server): drain queued native child continuations