Astra: region HA spec 2, round 10

Rev 10 follows Paul's ruling H25: spec 2 doesn't empty the old boxes. Each region's old box keeps its instances. The roster role legacy, or platform in IE, excludes it from every new placement and every relocation or move target. At the cut-over it swaps to a new public address of its own. The live drain is spec 4's. §22 maps round 9 and the earlier draining findings.

Judge:

1. Are round 9's findings and the draining machinery genuinely moot under H25? Is the role exclusion sound against internal/boxchoice, internal/hostrelocate and the move code? Can any path still need the old box to be empty?
2. The old box's address swap at the cut-over (§9 step 3): forced republication, cross-region forwarding to its instances, and IE's relay and MX switching with it.
3. The two rollback sequences (§9).
4. Anything new across the whole spec. This is a full pass: report any P1/P2/P3, not only rev 10's changes.

Give findings P1/P2/P3 with file:line and a failure scenario. End with a verdict: ready for a plan, or not.