desktop(react): own Job / Launch Review

[Whiteks1]

Summary

• add React-owned Job / Launch Review tabs for launch job status, stdout, stderr, linked run, artifacts, and deterministic failure context
• wire React context actions for job tabs while preserving /api/launch-control as the transitional Launch data boundary
• connect existing System/Paper Ops launch-review actions to the React-owned job surface
• update docs so Job / Launch Review is no longer a legacy-renderer blocker for desktop(cleanup): post-v1 legacy shell retirement boundary #412

Scope

This is the narrow #436 implementation.

Out of scope:

• no desktop(cleanup): post-v1 legacy shell retirement boundary #412 cleanup
• no legacy renderer deletion
• no research_ui removal
• no React default switch
• no Launch redesign or expansion
• no Stepbit / Quant Pulse / risk calculator work

Validation

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

Attempted but not used as a local blocker:

• npm run -s smoke:real-path failed locally because research_ui did not become reachable on Windows (serverReady=false, apiReady=false), while Desktop happy-path checks were true. Remote desktop-real-path should be authoritative.

Closes #436

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