Decode save-side placed-structure footers

docs/rehost-queue.md

@@ -18,7 +18,9 @@ Working rule:
   or class discriminator that can drive shellless city-connection service.
 - Reconstruct the save-side placed-structure collection body on top of the newly grounded
   `0x36b1/0x36b2/0x36b3` header seam so the blocked city-connection / linked-transit branch can
-  stop depending on atlas-only placed-structure and local-runtime refresh notes.
+  stop depending on atlas-only placed-structure and local-runtime refresh notes, especially the
+  semantics of the now-grounded compact `0x55f3` footer dword/status lane and any deeper side
+  buffers beyond the repeated `0x55f1/0x55f2/0x55f3` triplet envelope.
 - Extend shellless clock advancement so more periodic-company service branches consume owned
   runtime time state directly instead of only the explicit periodic service command.
 - Keep widening selected-year world-owner state only when a full owning reader/rebuild family is
@@ -69,6 +71,10 @@ Working rule:
   live-id/count headers, fixed `0x22`-byte rows, profile names, and trailing weight scalars, so
   the remaining region work is on the unresolved payload fields above that collection rather than
   on the profile subcollection itself.
+- The placed-structure tagged save stream now also exposes repeated `0x55f1/0x55f2/0x55f3`
+  triplets with dual name stems, a fixed five-`f32` policy row, and a compact `0x5dc1...0x5dc2`
+  footer carrying one raw `u32` payload lane plus one live `i32` status lane, so the remaining
+  placed-structure work is semantic closure of those owned fields rather than envelope discovery.
 - Stepped calendar progression now also refreshes save-world owner time fields, including packed
   year, packed tuple words, absolute counter, and the derived selected-year gap scalar.
 - Automatic year-rollover calendar stepping now invokes periodic-boundary service.