test(desktop): restore real-path smoke semantics

[Whiteks1]

Summary

• parse explicit desktop smoke modes and pass them into Electron
• keep fallback smoke isolated and tolerant while making real-path smoke require reachable research_ui
• rename CI coverage to desktop-real-path and run the explicit real-path command

Issue

• Closes devops(desktop): restore real-path desktop validation and clarify smoke semantics #275.

Why

• the old smoke:real-path name implied a guarantee the desktop smoke did not actually enforce
• maintainers need explicit separation between fallback shell coverage and real research_ui reachability
• CI should fail when the live desktop path is broken instead of passing through local artifact fallback

Scope

This PR does not:

• refactor renderer UX
• change engine/core contracts
• broaden desktop behavior beyond smoke semantics and CI naming

Validation

Validated with:

• npm run smoke:fallback
• npm run smoke:real-path
• python -c "import yaml, pathlib; yaml.safe_load(pathlib.Path(r'.github/workflows/ci.yml').read_text(encoding='utf-8')); print('ci.yml parse ok')"

Duplication Check

• I searched for an existing issue covering this slice.
• I kept fallback and real-path smoke as separate semantics instead of overloading one command name.
• I did not mix this branch with unrelated desktop UX or core changes.

Compatibility / Risk

• fallback smoke remains available for tolerant shell/bootstrap coverage
• real-path smoke now requires reachable research_ui, so CI becomes stricter by design
• the main risk is CI/environment drift around desktop bootstrap, which is exactly the surface this slice is meant to expose

Notes

• the branch was refreshed against current origin/main before merge review
• fallback smoke now seeds its temporary runs index under the smoke output root instead of depending on real project outputs

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