- Delete the empty "Application Lifecycle" page (was just a TODO placeholder)
- Expand "Storing C Data" from stub to full documentation covering foreign classes, initialization, access, and finalization
- Add note that VM is not re-entrant; warn against calling wrenCall/wrenInterpret from foreign methods
- Fix broken cross-reference links (configuring-the-vm.html, wren.hpp include)
- Clarify slot API usage: remove confusing sentence about implicit return of receiver
- Fix grammar: "each VM them differently" → "each VM differently", "is only be called" → "is only called"
- Improve phrasing throughout for clarity and consistency
Refine phrasing in the embedding guide for better readability: change "generate a runtime error" to "generate runtime errors", reword "What that gives you in return" to "What you get in return", and replace "get to the public header" with "find the public header" for more natural expression.
Rename the `WrenValue` type to `WrenHandle` in the public C header, update all
function signatures (`wrenMakeCallHandle`, `wrenCall`, `wrenReleaseHandle`),
and rename the documentation page from "Slots and Values" to "Slots and Handles"
with corresponding link updates throughout the embedding guide and module source
files.
