docs: add docs/README.md reading-order index

docs/README.md

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+# Research dossier — reading order
+
+Read the five main-line documents in this order. Each states its own evidence boundary; none establishes novelty or publishability on its own.
+
+1. `research_decision.md` — which project runs first and why (engineering allocation, not a novelty finding).
+2. `novelty_matrix.md` — novelty matrix; reference IDs resolve to `literature_review.md` and `evidence/papers.json`.
+3. `mathematical_analysis.md` — analytical derivations proved under stated assumptions; numerical checks live in `results/`.
+4. `literature_review.md` — literature and novelty verification, evidence standard and per-reference status.
+5. `experiment_plan.md` — dataset audit, access status and planned runs; no benchmark completed yet.
+
+Supporting records:
+
+- `manuscript_outline.md` — writing outline.
+- `research_log.md` — milestone log.