feat(desktop): add native run detail surface

[Whiteks1]

Summary

• Reactivates desktop(migration): run detail and artifact explorer native surfaces #409 from the saved WIP checkpoint on a clean branch based on current origin/main.
• Adds a native Run Detail surface with integrated artifacts view.
• Adds a React TabsBar for native workbench tab navigation.
• Updates renderer wiring and smoke coverage for the native run/artifacts happy path.

Issue

• Closes desktop(migration): run detail and artifact explorer native surfaces #409
• Refs desktop(renderer): migrate run detail and artifacts surfaces #351
• Refs feat(desktop): build artifact explorer around canonical outputs #265
• Refs desktop(migration): paper ops, system, and experiments native surfaces #410

Source / Reactivation

This PR was created with the controlled reactivation path agreed after the Desktop convergence block:

• source WIP branch: feat/desktop-native-run-detail
• source WIP commit: 3fab62e77832f9e49c0c1759cb2579b5dd9e59e8
• new clean branch base: origin/main after desktop(platform): document convergence status and unblock roadmap #419
• cherry-pick result: clean, no conflicts

Scope

In scope:

• Native Run Detail surface.
• Artifacts integrated into the Run Detail surface.
• TabsBar needed for native workbench navigation.
• Minimal legacy bridge wiring required by the new native surface.
• Smoke updates that assert native Run Detail and artifacts readiness.

Out of scope:

• desktop(migration): paper ops, system, and experiments native surfaces #410 Paper Ops/System/Experiments migration.
• Stepbit product decisions.
• Quant Pulse product decisions.
• Risk calculator surface expansion.
• Branding/layout changes beyond what the native Run Detail surface requires.
• Broad legacy cleanup.

Validation

Validated from desktop/:

• npm ci
• npm run -s typecheck
• npm run -s build
• npm run -s smoke:fallback
• npm run -s smoke:real-path
• node --test tests/snapshot-status.test.mjs
• git diff --check

Note: the first smoke:real-path run failed because research_ui did not become reachable before timeout, while the native run detail/artifacts happy path was ready. A second run passed. No code change was made for that transient reachability event.

Boundary Check

This stays inside #409. It does not reopen platform convergence and does not start #410.

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