- New `crates/project/src/file_check.rs`: a no-output `Serializer` that walks the value once. It refuses non-finite numbers and nesting past 127 levels, and it allocates only on error.
- `to_file_json_with_view` runs that check, then writes the file. It also refuses a project schema newer than this build, the remaining thing `from_json` would reject in a file we wrote.
- **Debug builds still reparse the text as well**, so a new kind of mismatch still shows up in tests.
The bytes written are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
