Add dynamic ZCU and ZPPI shadow foundations

docs/protocol-economics-p1-status.md

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+# Protocol Economics P1 Status
+
+Working paper reference: 19 August 2026, v0.1.
+
+This tranche is shadow-only and does not activate monetary supply changes.
+
+Implemented here:
+
+- dynamic per-work-class ZCU references from verified slot evidence;
+- deterministic weighted median, EWMA smoothing and per-epoch rate limiting;
+- ZPPI price-relative basket for compute, data availability and storage;
+- reliability/coverage gates for thin economic data;
+- canonical annual ZPPI factor `1_020_408_163`, derived from a 2% purchasing-power decline;
+- tokenomics documentation migrated away from a fixed 2% supply-growth objective.
+
+The pre-existing supply-growth controller remains a legacy shadow simulator until ZPPI is integrated into the monetary epoch path.
+
+Next P1 tranche:
+
+- dormancy histogram;
+- ProductiveCoverage hooks;
+- capital-lineage metadata;
+- fragmentation/state carrying-cost simulation;
+- adversarial wallet-splitting scenarios.