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/notcore/src/error.rs

@@ -17,6 +17,12 @@ pub enum NotfilesError {
     #[error("state file error: {0}")]
     State(String),
 
+    #[error("glob error: {0}")]
+    Glob(String),
+
+    #[error("validation error: {0}")]
+    Validation(String),
+
     #[error("{0}")]
     Io(#[from] std::io::Error),