Add "Ghosts in the Compilation" post

A debugging story:
- `cargo-semver-checks` says a crate doesn't compile.
- `cargo check` says it's fine.

A lot of documentation-reading, coding, and 28 test cases later, they finally agree.

Author: obi1kenobi

draft/2025-11-05-this-week-in-rust.md

@@ -46,6 +46,7 @@ and just ask the editors to select the category.
 ### Project/Tooling Updates
 
 ### Observations/Thoughts
+- [Ghosts in the Compilation](https://predr.ag/blog/ghosts-in-the-compilation/)
 
 ### Rust Walkthroughs