Refactor and enhance filesystem navigation and communication between Katas

- Updated `mi.zig` to default target path to an empty string.
- Improved context switching in `context.zig` by restoring registers from the context struct.
- Enhanced `loader.zig` to inherit current location from the parent Kata.
- Simplified `getkeychar.zig` by removing unnecessary serial import and error handling.
- Added new invocations: `getlocation.zig` for retrieving current stack location and `postman.zig` for letter passing between Katas.
- Introduced `setlocation.zig` to change current stack location with path resolution.
- Created `nav.zig` for navigating the filesystem with commands to print current location or change it.
- Added `nav.zon` for binary metadata.
- Updated `limits.zig` to define maximum letter length.
- Enhanced `ash.zig` to process navigation letters and improved command execution flow.
- Updated syscall interface in `sys.zig` to handle variable arguments for invocations.

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