[Pentexa]

Modernizes the documentation system for the METARGON research project.

Changes

• Rewrote README.md (landing page): crow-inspired motivation, agent loop (observe/learn/hypothesize/plan/act), research status, milestones from CORVID v0.1 through METARGON v0.11, Academy/EVREN and independent audit results (positive and negative), Mermaid architecture diagram, quick-start commands, roadmap, limitations, contribution/license. Preserves existing branding and banner.
• Added docs/README.md - documentation index.
• Added docs/GETTING_STARTED.md - prerequisites, verified first commands, Academy CLI + EVREN reference.
• Added docs/ARCHITECTURE_OVERVIEW.md - implementation-level architecture (belief, hypothesis memory, planner, Academy, EVREN validation chain, evaluation).
• Added docs/RESEARCH_INDEX.md - authoritative map of all versions/reports/findings with full result tables and explicit unmerged-work boundaries.
• Added docs/BENCHMARK_GUIDE.md - verified reproduction commands for every benchmark, ablation, suite, and audit.

Accuracy & hygiene

• All numbers are transcribed from committed research reports/raw results; no fabricated metrics. v0.12 and Academy v0.4 are explicitly not presented as completed.
• Verified: python scripts/check_repo.py passes (merge markers, Markdown links, Python compile); benchmark/CLI entry points smoke-tested (v0.11 benchmark run, Academy CLI loads, unit discovery OK).
• Only documentation files changed (no source/experiment/test/CI/raw-result modifications).

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