refactor: update dependencies and remove unused code

- Added new dependencies: `adler2`, `crc32fast`, `flate2`, `miniz_oxide`, and `libredox`.
- Updated existing dependencies: `tokio-rustls` to version 0.26.4 and `filetime` to version 0.2.27.
- Removed the `backup.rs` file as it is no longer needed.
- Introduced tests for configuration and credential management.
- Enhanced the `identity` module to generate W3C compliant DID documents.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/startos-dependency-audit.md

@@ -0,0 +1,28 @@
+# StartOS Dependency Audit — 2026-03-10
+
+## Summary
+
+**`core/archipelago/` has ZERO dependencies on `core/startos/`.** The startos directory is dead code — not compiled, not imported, not referenced by any active module.
+
+## Findings
+
+### Workspace
+- `core/Cargo.toml` workspace members: `archipelago`, `container`, `parmanode`, `performance`, `security`
+- `startos` is NOT a workspace member
+
+### Dependencies
+- `core/archipelago/Cargo.toml`: no startos dependency
+- `core/container/Cargo.toml`: no startos dependency
+- All other core modules: no startos dependency
+- `cargo tree -p archipelago`: startos does not appear
+
+### Source Code
+- Zero `use startos::*` imports in `core/archipelago/src/`
+- Zero references to startos in any active Rust code
+- No git submodule reference
+
+### Status
+`core/startos/` contains a StartOS fork (`start-os` v0.3.5-rev.1) that is present on disk but completely inert. It can be safely removed.
+
+## Action
+Remove `core/startos/` directory. No migration needed — there are no dependencies to migrate.