Inherit hibernation across Server subclasses

[threepointone]

What changed

• Resolve hibernate through the server constructor chain, using the nearest explicitly configured value.
• Cache that resolved value and use it consistently for connection-manager selection and socket-handler attachment.
• Add a Workers integration regression proving that a child with partial static options still registers its socket through the Durable Object Hibernation API.
• Document the inheritance behavior and add a patch changeset for partyserver.

Root cause

PartyServer read this.#ParentClass.options.hibernate directly. A child class that declared its own partial static options object shadowed the hibernating base class object, leaving hibernate undefined. PartyServer then silently selected the in-memory connection manager.

This is the underlying cause of cloudflare/agents#2012. Once this ships, cloudflare/agents#2022 can replace its pre-super() compatibility workaround with the new PartyServer release.

Reproduction

Before the fix, the regression connected through a child of a hibernating server whose own static options were empty. ctx.getWebSockets() returned 0, proving the socket had been accepted in memory. It returns 1 after the fix.

Validation

• npm run build -w partyserver
• npm run check
  • repository consistency and formatting
  • lint
  • all 42 TypeScript projects
  • PartyServer: 88 tests
  • PartySocket: 325 tests
  • Partysub, Partywhen, Partytracks, and Y-PartyServer suites

[changeset-bot]

🦋 Changeset detected

Latest commit: 93888ab

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
partyserver	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

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hono-party

npm i https://pkg.pr.new/cloudflare/partykit/hono-party@417

partyfn

npm i https://pkg.pr.new/cloudflare/partykit/partyfn@417

partyserver

npm i https://pkg.pr.new/cloudflare/partykit/partyserver@417

partysocket

npm i https://pkg.pr.new/cloudflare/partykit/partysocket@417

partysub

npm i https://pkg.pr.new/cloudflare/partykit/partysub@417

partysync

npm i https://pkg.pr.new/cloudflare/partykit/partysync@417

partytracks

npm i https://pkg.pr.new/cloudflare/partykit/partytracks@417

partywhen

npm i https://pkg.pr.new/cloudflare/partykit/partywhen@417

y-partyserver

npm i https://pkg.pr.new/cloudflare/partykit/y-partyserver@417

commit: 93888ab