feat(notfiles): hexagonal architecture refactor with adapters, integration tests, and notsecrets cleanup

- Extract FileStore port and InMemoryFileStore/FileStoreImpl/Reporter adapters
- Add Reporter trait to notcore with TerminalReporter and JsonReporter
- Refactor linker, package, status modules to use FileStore port
- Add integration test suite with dotfiles fixtures
- Add cross-crate integration tests
- Remove ssh_rsa identity/recipient (unsupported)
- Add rustqual.toml, .sccignore, notfiles.toml config files
- Update CLAUDE.md, README.md, AGENTS.md with current architecture

crates/notsecrets/src/identities/mod.rs

@@ -9,9 +9,6 @@ pub use ssh_ed25519::SshEd25519Identity;
 pub mod scrypt;
 pub use scrypt::ScryptIdentity;
 
-pub mod ssh_rsa;
-pub use ssh_rsa::SshRsaIdentity;
-
 pub mod encrypted;
 pub use encrypted::EncryptedIdentity;