tracking: one ledger, one authority — prune protection and replace-vs-add answered from the same records, fail-safe on unreadable state

src/core/tracking/CMakeLists.txt

@@ -0,0 +1,10 @@
+reasampler_pure_library(origin_ledger SOURCES origin_ledger.cpp LINK PRIVATE json)
+reasampler_test(origin_ledger LINK origin_ledger json)
+
+# prune_reconcile + bank_book are linked into the authority's test, not the library:
+# the test proves end-to-end that a tied usage can never reach the orphan set, which
+# is the "consumers cannot disagree" property stated at the pure layer.
+reasampler_pure_library(tracking_authority
+    SOURCES tracking_authority.cpp
+    LINK PUBLIC origin_ledger sample_usage)
+reasampler_test(tracking_authority LINK tracking_authority prune_reconcile bank_book)