fix: Move DID anchoring provenance to registration

[macterra]

Summary

Fixes #702.

• omits method-specific anchoring provenance from conformant /1.0/identifiers/{did} metadata
• removes didDocumentMetadata.confirmed and didDocumentMetadata.timestamp from the conformant DID Resolution result
• exposes confirmed and timestamp through /1.0/identifiers/{did}/registration alongside the registration resource
• keeps TypeScript and Rust Gatekeeper surfaces aligned
• updates Gatekeeper docs and generated Gatekeeper OpenAPI descriptions

Validation

• node --experimental-vm-modules node_modules/.bin/jest tests/gatekeeper/api.test.ts --runInBand --verbose
• cargo test --manifest-path rust/services/gatekeeper/Cargo.toml --test http_contract -- --nocapture
• npm run generate-openapi

Note: the Rust test run still reports the existing unused import warning for queue_outbound_operation in rust/services/gatekeeper/src/lib.rs.

[Copilot]

Pull request overview

This PR updates Gatekeeper’s standards-conformant DID Resolution surface to keep /1.0/identifiers/{did} “fixture-friendly” by removing method-specific anchoring provenance from didDocumentMetadata, and instead exposing that provenance via the dereferenceable registration resource at /1.0/identifiers/{did}/registration. It aligns the TypeScript and Rust implementations and updates the Gatekeeper documentation/OpenAPI output accordingly.

Changes:

• Remove didDocumentMetadata.confirmed and didDocumentMetadata.timestamp from conformant /1.0/identifiers/{did} responses (TS + Rust) and adjust tests to lock this in.
• Augment /1.0/identifiers/{did}/registration to include confirmed and timestamp alongside the registration resource (TS + Rust).
• Update Gatekeeper docs and generated OpenAPI description to document the new provenance location and rationale.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/gatekeeper/api.test.ts	Updates Jest expectations to ensure conformant resolution omits anchoring provenance and /registration returns it.
services/gatekeeper/server/src/identifiers-router.ts	Removes confirmed/timestamp from conformant didDocumentMetadata and builds an augmented registration resource for /registration.
rust/services/gatekeeper/tests/http_contract.rs	Updates Rust HTTP contract test to assert provenance is omitted from conformant resolution and exposed via /registration.
rust/services/gatekeeper/src/api.rs	Mirrors the TS behavior: strips provenance from conformant metadata and augments /registration output.
docs/services/gatekeeper/README.md	Documents the provenance move: conformant resolution stays “boring”; /registration carries confirmation/timestamp details.
docs/gatekeeper-api.json	Updates generated OpenAPI descriptions to reflect the provenance move and registration augmentation.

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