Description

Fixes two user-visible failure modes when IPFS is misconfigured:

1. UI hangs indefinitely at "Publish DID Document" with no error surfaced.
2. Misleading MISSING_PROPERTIES_IN_CONTEXT JSON-LD error that hides the real cause.

Four chained defects are addressed:

• IpfsClientClass dereferences an uninitialized client. Added assertClientReady() guard on addFile / deleteCid so a failed client init produces a readable error instead of TypeError: Cannot read properties of undefined (reading 'uploadFile'). The worker process is intentionally kept alive so per-tenant misconfiguration in multi-tenant forks doesn't take the whole worker down.
• queue-service suppressed TASK_COMPLETE for user-facing tasks. Removed two if (!task.interception) guards so terminal failures always publish the completion event. Every call site that sets interception already pairs with registerCallback: true, and no alternate completion path exists, the guards were dormant-bug code. Awaiting Promises in addRetryableTask / addNonRetryableTask now reject instead of hanging.
• createSystemSchemas swallowed publish errors. Rethrow instead of returning null. The null return is now reserved for the legitimate "no entity schema" case. A fail-fast guard in createUserProfile now throws System schema for entity "X" not found. when the template is missing, rather than signing a VC without @context.
• DID publish step silently swallowed its own error. Rethrow so profile setup aborts at the failing step instead of cascading through schema publishing and VC creation with corrupt state.

Related issue(s):

Fixes #5992

Notes for reviewer:

• worker-service/src/api/ipfs-client-class.ts – assertClientReady() guard added to addFile and deleteCid.
• queue-service/src/queue-service/queue-service.ts – removed !task.interception guards in the TASK_COMPLETE handler.
• guardian-service/src/api/helpers/profile-helper.ts – rethrow in createSystemSchemas, rethrow on DID publish failure, fail-fast guard before VC signing.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)