Superseded by #457 — dnsthread wakeup registration fix

[tokenjunkielabs]

Superseded by #457, the clean TokenJunkieLabs one-file carrier for first-reporter bounty #438. Keep sponsor review/payment adjudication on #457.

[tokenjunkielabs]

Maintainer follow-up on #438:

• PR Superseded by #457 — dnsthread wakeup registration fix #451 is now at exact head ba7202c3ce1c7f4aff9feec9dea06aef4d313eba on current master@1881fdb0c56ab12f4cc745214980ca2c90fe0660.
• The production change is unchanged in intent: register the wakeup listener before handing work to the resolver; unwind listener/state if signalling fails.
• tests/dnsthread-resolve now has deterministic failure injection which proves registration failure sends zero worker signals and leaves the resolver sleeping, while signal failure cancels the registered listener and restores THREAD_SLEEPING before returning.
• Exact-head Compile & test run 35528745835 is currently action_required, so no CI-green claim is being made.

Could you please approve the workflow / review the current head and classify #438 under the published bug-bounty schedule for reporter woahwhattheheck? No further source changes are planned unless review finds a concrete problem.