Refine README for agentic onboarding and roadmap

[albertjanvanhoek]

Motivation

• Improve repository discoverability and machine-first ingestion by balancing scannability with the original conceptual depth so agents and humans can ground quickly.
• Restore and surface core theoretical anchors (dependency model, operators, formal hooks) that are most useful for agentic reasoning and long-horizon planning.
• Provide a pragmatic next-step roadmap so future work is operationally useful to autonomous systems rather than only narrative.

Description

• Rewrote and reorganized README.md into a clear quick-start (human + LLM/agent), concise core thesis, compressed principles/operators, formal highlights, testable prediction families, role-based reading paths, and repository structure. The agent reading order is now explicit (README.md, Chapters/Chapter_1.tex, Chapters/Chapter_6.tex, Backmatter/Appendix26.tex, Backmatter/Appendix.tex/Backmatter/AppendixIII.tex, Chapters/Chapter_13.tex).
• Restored stronger conceptual framing: the INTELLIGENCE (I) -> BODY (B) -> RESOURCES (R) -> PLANET (P) dependency, the three Existence First operators (O1, O2, O3), and SCAP as an operational layer are summarized and made machine-friendly.
• Added an explicit agent-first improvement roadmap listing high-impact deliverables to add next (e.g. AGENT_INDEX.md, concepts.json, benchmarks/, CLAIMS.md, versioned stability labels, and cross-reference normalization) to drive future automated ingestion and evaluation.
• This is a documentation-only change (no runtime or code changes) and reorganizes navigation/build instructions and citation/contributing guidance for clarity.

Testing

• Verified referenced key files exist using for f in Chapters/Chapter_1.tex Chapters/Chapter_5.tex Chapters/Chapter_6.tex Chapters/Chapter_13.tex Backmatter/Appendix26.tex Backmatter/Appendix.tex Backmatter/AppendixIII.tex Backmatter/AppendixV.tex Backmatter/AppendixVI.tex Backmatter/AppendixXIII.tex mkdocs.yml citation.cff; do test -f "$f" || echo "missing: $f"; done, which reported no missing files.
• Inspected the updated README.md contents with nl -ba README.md | sed -n '1,260p' and reviewed the git diff -- README.md | sed -n '1,260p' to confirm the new layout and sections rendered as intended.
• Committed the change to the current branch (documentation-only) and no automated failures were produced by the above verification steps.

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Codex Task