Astra round 2: Task 10b, rev 5.4.1 (confirming)

Round 1 (CODEX-PLAN-REGION-HA-TASK-10B-R1.md) found one P2. When the first reconcile after the fence was delayed past ToInstalling, CheckLocal looked for the target's stamp on the source. It refused before holdOnly, and the row stayed ready.

The fix, rev 5.4.1 (e236acd5).

• The hold-only path checks the source's own installation through a new EmptyInstallationCensus.CheckHeld, which the adapter sets.
• That check grants no installation authority, and an unreadable or contradicting inventory refuses.
• A new test uses the real adapter, census and provision pass, with the reconcile delayed until installing. It reproduced the defect and now passes.

Judge:

1. Is the P2 closed?
2. Can CheckHeld accept a source whose installation is not this host's? Can it be used anywhere to grant installation authority?
3. Is anything new introduced?

Give findings P1/P2/P3 with file:line, then a verdict: ready to build, or not.