docs

README.md

@@ -354,3 +354,4 @@ The project includes comprehensive tests:
 ./test_secret_manager.sh  # Full integration test suite
 go test ./...             # Unit tests
 ```
+

TODO.md

@@ -16,6 +16,14 @@ This document outlines the bugs, issues, and improvements that need to be addres
 
 ### Core Functionality Bugs
 
+- [ ] Multiple vaults using the same mnemonic will derive the same long-term
+keys.  Adding additional vaults with the same mnemonic should increment the
+index value used.  The mnemonic should be double sha256 hashed and the hash
+value stored in the vault metadata along with the index value (starting at zero)
+and when additional vaults are added with the same mnemonic (as determined by
+hash) then the index value should be incremented.  The README should be updated
+to document this behavior.
+
 - [ ] **Directory structure inconsistency**: The README and test script reference different directory structures:
   - Current code uses `unlock.d/` but documentation shows `unlock-keys.d/`
   - Secret files use inconsistent naming (`secret.age` vs `value.age`)