feat(proto): reveal oracle request for simulation

[ryutamago]

Context

This is the final step enable oracle simulation in the kernel.

Closes: JSTZ-1048

Description

• Moved Revealer trait to jstz_core: This makes the trait available for both simulation and non-simulation modes.

• Refactored process_and_dispatch_request: Split the implementation into:

  • process_and_dispatch_request_impl<Rv: Revealer> - A generic implementation that accepts any type implementing Revealer
  • Two feature-gated wrapper functions process_and_dispatch_request that call the impl with:
    • HostRevealer for simulation mode (uses reveal channel for oracle requests)
    • () stub type for non-simulation mode (oracle requests use protocol context instead )

• Added simulation oracle dispatch: Implemented dispatch_oracle::<Rv> for simulation mode that encodes HTTP requests and sends them via the reveal channel using simulation::send_request.

• Added error conversion: Implemented From<jstz_core::Error> for Response to handle reveal channel error.

• Cleaned up the imports of fetch_handler.rs: grouped the imports by crates

• Updated Makefile to run proto test with the simulation feature

Manually testing the PR

• existing test passes
• cargo nextest run -p jstz_proto --features v2_runtime,simulation

[codecov]

Codecov Report

❌ Patch coverage is 77.27273% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.61%. Comparing base (f0500f6) to head (31d9895).

Files with missing lines	Patch %	Lines
crates/jstz_proto/src/runtime/v2/fetch/http.rs	0.00%	8 Missing ⚠️
crates/jstz_core/src/revealer.rs	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
...s/jstz_proto/src/runtime/v2/fetch/fetch_handler.rs	95.86% <100.00%> (+0.02%)	⬆️
crates/jstz_core/src/revealer.rs	0.00% <0.00%> (ø)
crates/jstz_proto/src/runtime/v2/fetch/http.rs	94.81% <0.00%> (-1.83%)	⬇️

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f0500f6...31d9895. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.