feat(adaptors): add a Casework adaptor and pin the published Registry client 0.32.0

[jeremi]

Summary

Adds a Registry Casework adaptor and moves the Evidence and BREG adaptors to the published @registrystack/client@0.32.0.

Casework adaptor (@openfn/language-registry-casework)

• Requester operations over the client's casework namespace: create and read the caller's own hosted items, add and read notes, cancel an item, and poll the caller's terminal feed.
• Task operations: read the source inbox and current item, preview grant templates, read grants, and explicitly approve or revoke a grant.
• The adaptor never claims, releases or decides a human work item, and never places a task assertion in workflow state. Casework enforces ownership and authorization from the token identity, the configured profile and the source profile; workflow data cannot choose a token or profile.
• Nested inputs built inside the OpenFn VM are materialized before native validation.
• Example jobs for creating a request and polling terminal results, plus unit tests and a native test against a synthetic HTTP server.

Evidence and BREG adaptors

• Pin @registrystack/client to 0.32.0.
• Accept the client's authorization: { exchange: ... } configuration (BREG explicit clients; Evidence explicit and profile clients), mutually exclusive with a static token or private key.
• BREG private-key JWT configuration accepts resource and scopes.
• Progressive Evidence success returns retained_verification, base64 of the native verification snapshot, for callers that retain audit material alongside the signed bytes.

Verification

• npm run check: Evidence 17, BREG 13, Casework 13, event services 30, pilot 33 Node tests and 16 Python tests, all passing against the published 0.32.0 client.
• npm run pack:dry-run for all three adaptors.
• Linux pilot acceptance: the worker image asserts the pinned 0.32.0 client. The pilot's BREG, Evidence and Mint images and bootstrap tools stay at 0.27.0, so this job exercises the 0.32.0 client against those 0.27.0 services; moving the pilot services to 0.32.0 is separate work.

The adaptors are not published by this PR.

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