Probe save-side region and structure headers

docs/README.md

@@ -191,6 +191,10 @@ The highest-value next passes are now:
   electric-only periodic-company override rewrites the world route-preference byte to the
   effective company preference, ending it restores the base world byte, and runtime service state
   now carries both the active and last applied override
+- save inspection now also exposes the tagged live region header `0x5209/0x520a/0x520b` and the
+  tagged placed-structure header `0x36b1/0x36b2/0x36b3` as first-class owner seams, so the
+  remaining city-connection / linked-transit blocker is record-body reconstruction rather than
+  missing save-side collection identity
 - the project rule on the remaining closure work is now explicit too: when one runtime-facing field
   is still ambiguous, prefer rehosting the owning source state or real reader/setter family first
   instead of guessing another derived leaf field from neighboring raw offsets; the checked-in

docs/rehost-queue.md

@@ -9,11 +9,13 @@ Working rule:
 
 ## Next
 
-- Rehost the next live branch inside
-  `company_service_periodic_city_connection_finance_and_linked_transit_lanes`, especially the
-  city-connection announcement / linked-transit roster-maintenance side that now sits on top of
-  the owned periodic-service seam and the new route-preference apply/restore mutation seam instead
-  of loose atlas notes.
+- Reconstruct the save-side region record body on top of the newly grounded tagged region header,
+  especially the pending bonus lane `[region+0x276]`, completion latch `[region+0x302]`, one-shot
+  notice latch `[region+0x316]`, severity/source lane `[region+0x25e]`, and any stable region-id
+  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.
 - 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
@@ -40,9 +42,18 @@ Working rule:
 - Full shell/dialog ownership remains intentionally out of scope.
 - Any candidate slice that requires guessing rather than rehosting owning state or real
   reader/setter families stays blocked until a better owner seam is grounded.
+- The city-connection announcement / linked-transit roster-maintenance branch is still blocked at
+  the record-body level, not the header level: the runtime now has tagged region and
+  placed-structure collection header seams, but it does not yet reconstruct the live region or
+  placed-structure record bodies those service owners need.
 
 ## Recently Done
 
+- Save inspection now exposes the tagged region collection header (`0x5209/0x520a/0x520b`,
+  stride `0x1d5`) and the tagged placed-structure collection header
+  (`0x36b1/0x36b2/0x36b3`) as first-class owner seams, so the blocked city-connection /
+  linked-transit queue now has grounded save-side collection counts and ids to build on instead of
+  only atlas notes.
 - 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.

docs/runtime-rehost-plan.md

@@ -269,6 +269,10 @@ electric-only periodic-company override rewrites `[world+0x4c74]` to the effecti
 preference for the active service pass, ending the override restores the base world byte, and
 runtime service state now carries both the active and last applied override instead of leaving the
 route-preference seam as a pure reader note.
+Save inspection now also exposes the tagged live region header `0x5209/0x520a/0x520b` and the
+tagged placed-structure header `0x36b1/0x36b2/0x36b3` as first-class owner seams, so the
+remaining city-connection / linked-transit blocker is record-body reconstruction rather than
+missing save-side collection identity.
 That same seam now also carries the fixed-world building-density growth setting plus the linked
 chairman personality byte, which is enough to rehost the annual stock-repurchase gate on owned
 save/runtime state instead of another threshold-only note. The stock-capital issue branch now