Initial scaffold: docs, data manifest, and static dashboard

docs/data-structure.md

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+# Data Structure
+
+## Data Sources
+- CSV exports (source of truth)
+- DAX exports (measure definitions)
+
+## Storage
+- `/data/*.csv` — raw CSV exports
+- `/data/manifest.json` — list of CSV files loaded by the app
+
+## Notes
+- No database yet; app loads CSVs directly via fetch.
+- Column types and relationships will be documented here once data lands.

docs/kpi-definitions.md

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+# KPI Definitions
+
+> This file will map each KPI to its exact formula and validation notes.
+
+## Template
+| KPI Name | Definition | Source Tables | Filters | Notes |
+|---|---|---|---|---|
+| Example KPI | SUM(Table[Amount]) | Table | DateRange | Match Power BI card |

docs/migration-plan.md

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+# Migration Plan
+
+## Phase 1 — Intake & Inventory
+- [ ] Collect CSV/DAX exports and source report screenshots
+- [ ] Document data model + relationships
+- [ ] Identify all KPIs and filters
+
+## Phase 2 — KPI Definition
+- [ ] Translate each DAX measure into deterministic formulas
+- [ ] Validate calculations against source data
+
+## Phase 3 — Backend Logic (Local)
+- [ ] Implement KPI calculations in JS (no database yet)
+- [ ] Build reusable aggregation utilities
+
+## Phase 4 — UI Buildout
+- [ ] Recreate filters, charts, and tables
+- [ ] Match layout/visual hierarchy
+
+## Phase 5 — Validation
+- [ ] Compare KPI outputs to Power BI values
+- [ ] Iterate until exact match