feat: Add various invocations for file system and I/O operations

- Implemented `viewstack` invocation to list contents of a stack.
- Created `attach` invocation for opening attachments with device and unit handling.
- Added `getkeychar` invocation to read a single character from the keyboard.
- Developed `mark` invocation to write to attachments with color support.
- Introduced `seal` invocation to close attachments.
- Implemented `view` invocation to read from attachments.
- Added `wipe` invocation to clear the terminal screen.
- Created `exit` invocation to dissolve a Kata and seal attachments.
- Implemented `postman` invocation for letter passing between parent and child Katas.
- Added `spawn` invocation to create new Katas from executables.
- Implemented `wait` invocation to wait for child Katas to dissolve.
- Added `yield` invocation to voluntarily give up CPU time to Sensei.
- Introduced utility functions for location resolution and path handling.
- Added memory copy and slice utilities for efficient data manipulation.
- Implemented random number generation utilities.
- Added string comparison utilities for easier string handling.
- Introduced integer and pointer conversion utilities for type safety.
- Implemented result handling utilities for invocation results.

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