Upgrade reviewer to GPT-5.6 Sol

[Ingar30]

Summary

• use GPT-5.6 Sol as the single quality configuration: xhigh for substantive reviewers/editor and high for preflight/routing
• improve deterministic, source-faithful PDF preprocessing and remove the LLM parser-repair layer
• use conservative reviewer applicability, add source-consistency and theory-logic coverage, and preserve evidence through normalization/editor assembly
• refine the editor toward concrete corrections before broader suggestions
• update the concise Windows/macOS/Linux guide and incorporate the useful open contributor/Dependabot suggestions

Validation

• 96 unit tests passed
• environment, shareability, sensitive-name, compilation, and diff checks passed
• publish range contains no PDFs or files under inputs/, work/, outputs/, or output/

Supersedes the broader release work that grew from #3 and incorporates the useful changes proposed in #4, #5, #6, and #7.