chore: add the ASF header to the renderer-loss recovery files

[Astro-Han]

Summary

#3495 branched before #3397 landed, so its two new files arrived without the ASF header, and its CI run predates the audit job that #3397 added. check:asf-headers runs in ci.yml, so main is currently failing that check and every open PR inherits the failure until this lands.

npm run write:asf-headers produced this commit. Nothing else was touched.

Refs #3495, #3397

Verification

• node scripts/asf-license-headers.mjs check on main before this change: 2 files missing (apps/desktop/src/main/main-renderer-process-gone.ts and its test).
• Same command on this branch: clean.
• No behavior to test: both files gain a leading license comment and nothing else.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Claude Code — ran the header writer and wrote this description. The commit carries a Generated-by: Claude Code trailer.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[jackwener]

Two files from #3495 were missing the ASF header after the #3397 gate landed. This is exactly those headers, nothing else. Approve.