feat(workspace): configure pull ignore paths - #15

The sync server already accepts an ignore list, but Workspace could not supply one. Commands such as npm install could therefore pull generated trees like dist and .cache into durable storage even though those files only need to exist on the execution backend.

This adds WorkspaceOptions.ignore and passes it through pullOnce() on every backend pull. Patterns match whole path segments. Omitting the option preserves the server default of ["node_modules"]; a supplied list replaces that default, and [] disables filtering. Push behavior does not change.

const workspace = new Workspace({
  storage: ctx.storage,
  backends: [containerBackend],
  ignore: ["node_modules", "dist", "build", ".cache"],
});

The capnweb wire test verifies that a custom list crosses the real transport and filters the pull. Workspace tests cover replacement of the default and the empty-list case. npm test passes, along with typechecks for the RPC, Workspace, and Think example packages. The package README, sync documentation, and Think example describe the behavior.

After a release includes this option, cloudflare/agents can use one Workspace for durable files and command execution without pulling generated dependency and build trees into its Durable Object.