## Summary
- add a publisher preflight that rejects non-UTF-8 `server.json` bytes
before parsing
- reject unpaired UTF-16 surrogate escapes inside JSON string fields
before publish/validate requests are sent
- keep valid non-ASCII descriptions, including em dashes, round-tripping
through the publish path
- make the publisher test token helper set `USERPROFILE` as well as
`HOME` so Windows tests use the temp home directory
Closes#1306.
## To verify
- `go test ./cmd/publisher/commands -run
"TestPublishCommand_(Success|PreservesNonASCIIDescription|RejectsInvalidUTF8ServerJSON|RejectsUnpairedSurrogateEscape)$"
-count=1`
- `go test ./cmd/publisher/commands -run TestPublishCommand -count=1`
- `go test ./cmd/publisher/commands -run TestValidateCommand -count=1`
- `git diff --check`
Co-authored-by: Radoslav Dimitrov <radoslav@stacklok.com>
c36b521bf1