feat: added vrf ephemeral test queue, delegation record and metadata for mb-test-validator

[jonasXchen]

Summary

Adds a feature-gated ephemeral test queue (Sc9MJUng…) that is exempt from the per-request VRF fee — the same treatment as the canonical DEFAULT_EPHEMERAL_QUEUE — so a locally-created delegated queue can be served inside an Ephemeral Rollup without a fee-payer escrow. The exemption is centralized in is_fee_exempt_ephemeral_queue() and applied consistently across request_randomness, provide_randomness, and purge_expired_requests; the test queue is only compiled in under the ephemeral-test-queue Cargo feature, so production builds are unchanged.

Breaking Changes

• None
  (Feature is off by default. Without ephemeral-test-queue, only DEFAULT_EPHEMERAL_QUEUE/5hBR5… is exempt — identical to current behavior. The three fee call-sites were refactored to a shared helper with no behavior change; the SDK gains additive constants.)

Test Plan

Both build configs compile: cargo build-sbf --manifest-path program/Cargo.toml (production) and … --features ephemeral-test-queue.
Verified end-to-end locally: solana-test-validator (with the feature build + the pre-delegated Sc9MJ… queue/record/metadata) + ephemeral-validator + vrf-oracle (default paywJ identity) → roll-dice-delegated request was fulfilled in the ER (player state updated), with no fee charged and no Feepayer … was modified without being delegated / Sum of account balances … do not match errors.
Production fee path is unchanged: without the feature, is_fee_exempt_ephemeral_queue only matches DEFAULT_EPHEMERAL_QUEUE.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: e51ff734-e401-432a-a23a-e947d79fd42e

📥 Commits

Reviewing files that changed from the base of the PR and between ab56862 and 298f902.

📒 Files selected for processing (2)

• .github/packages/npm-package/mbTestValidator.ts
• .github/packages/npm-package/scripts/fetch-local-dumps.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/support-vrf-ephemeral-test-queue

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[GabrielePicco]

LGTM!