✨ add bounded history sink (#1)

docs/changes/1.2.0(0.8.0).md

@@ -0,0 +1,15 @@
+## BitLogger Update Changes
+
+version 1.2.0(0.8.0)
+
+### Changes
+
+- Add a bounded in-memory HistorySink for retaining the latest structured records.
+
+### Verification
+
+- Run formatting, warning-denied checks and tests, API generation, documentation build, and packaged-output validation.
+
+### Notes
+
+- HistorySink is synchronous and memory-only; persistence and export remain application-owned.

docs/changes/index.md

@@ -2,6 +2,7 @@
 
 Versioned BitLogger change summaries.
 
+- [1.2.0](./1.2.0(0.8.0).md)
 - [1.1.3](./1.1.3(0.7.3).md)
 - [1.1.2](./1.1.2(0.7.2).md)
 - [1.1.1](./1.1.1(0.7.1).md)