feat(ui): refresh control surface for Stepbit and execution venues

[Whiteks1]

Summary

This PR refreshes the local QuantLab UI so it reflects the system direction more faithfully.

Changes included:

• reposition the local dashboard as a read-only QuantLab control surface
• preserve the research registry as the main artifact table
• keep paper-session health visible
• add broker submission health visibility from canonical broker validation sessions
• add a Hyperliquid surface summary for:
  • venue preflight
  • account readiness
  • signed-action build progress
• add a Stepbit workspace boundary summary based on local stepbit-app and stepbit-core repos
• refresh the UI copy, stage map, and layout so the surface matches the current repo direction
• add focused tests for the new local summary helpers
• update the local preview README

Why

QuantLab has moved beyond a Stage C.1-only dashboard.

The repo now includes:

• structured paper-session operations
• broker safety and supervised submit work
• a real read-only Hyperliquid surface
• Stepbit as an external connected workspace boundary

The previous UI still read mainly like a paper-ops overlay on top of the research registry. This PR closes that gap and makes the local preview feel much closer to the future QuantLab surface without pretending runtime control already exists.

Scope

This PR does not:

• execute runs or orders from the UI
• add Stepbit runtime integration
• add broker submit controls
• migrate the UI to a frontend framework

The UI remains intentionally read-only and artifact-driven.

Validation

Validated with:

• node --check research_ui/app.js
• python -m py_compile research_ui/server.py
• python -m pytest -q test/test_research_ui_server.py
• git diff --check

Notes

• local workspace detection found both stepbit-app and stepbit-core, so the Stepbit boundary panel now reflects the real workspace rather than a placeholder concept
• the implementation, tests, and docs ended up in a single commit after a local git index collision while splitting commits; the diff is clean and validated

Closes #136

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