chore: release v0.8.42 (#3988)

* chore: release v0.8.42

- Studio preview works for projects whose path has non-Latin-1 characters (#3982)
- Studio render downloads use RFC 6266 headers for non-Latin-1 filenames (#3984)
- check --json reports HDR auto-promotion; render prints one warning (#3985)
- Forced --sdr renders tone-map HDR sources before extraction (#3981)
- Render/preview workers no longer survive as orphans after Ctrl-C or parent exit;
  cancellation reaches final artifact promotion; HYPERFRAMES_RENDER_DETACHED=1 for
  intentionally detached renders (#3974)
- HDR preflight test coverage for held tails (#3963)

Co-Authored-By: Miguel Ángel <miguel.sierra@heygen.com>

* chore: release v0.8.42 notes — name the #3982 symptom and scope

- #3982 entry: a Studio preview server crash for compositions whose file path
  has non-Latin-1 characters (the project directory is not involved)

Co-Authored-By: Miguel Ángel <miguel.sierra@heygen.com>

* chore: release v0.8.42 notes — name the #3982 symptom

- #3982 entry: the uncaught ETag TypeError took the preview server down, so
  call it a Studio preview server crash rather than a preview failure

Co-Authored-By: Miguel Ángel <miguel.sierra@heygen.com>

---------

Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>

packages/aws-lambda/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/aws-lambda",
-  "version": "0.8.41",
+  "version": "0.8.42",
   "description": "AWS Lambda adapter for HyperFrames distributed rendering — handler, client-side SDK, and CDK construct.",
   "repository": {
     "type": "git",