docs: add app tagging secret migration note

Author: vezenovm

docs/docs-developers/docs/resources/migration_notes.md

@@ -9,6 +9,22 @@ Aztec is in active development. Each version may introduce breaking changes that
 
 ## TBD
 
+### [Aztec.js] `ExtendedDirectionalAppTaggingSecret` renamed to `AppTaggingSecret`
+
+`ExtendedDirectionalAppTaggingSecret` has been renamed to `AppTaggingSecret`.
+
+**Migration:**
+
+```diff
+- import { ExtendedDirectionalAppTaggingSecret } from '@aztec/stdlib/logs';
++ import { AppTaggingSecret } from '@aztec/stdlib/logs';
+
+- ExtendedDirectionalAppTaggingSecret.fromString(value)
++ AppTaggingSecret.fromString(value)
+```
+
+**Impact**: Code importing or referencing `ExtendedDirectionalAppTaggingSecret` should update to `AppTaggingSecret`.
+
 ### [Aztec.nr] `public_checks` helpers moved to `aztec-nr`
 
 The `privately_check_timestamp`, `privately_check_block_number`, and related caller helpers previously in `noir-contracts/contracts/protocol/public_checks_contract/src/utils.nr` are now in `aztec-nr/aztec/src/public_checks.nr`. Consumer contracts should update their imports: