docs(33): add summaries for plans 03 and 04 (wave 2 complete)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/phases/33-currency-system/33-03-SUMMARY.md

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+# Plan 33-03 Summary
+
+**Status:** Complete
+**Completed:** 2026-04-13
+
+## What Was Built
+
+Market prices API, exchange rates endpoint, and currency context in item/candidate responses.
+
+### Key Changes
+- Created market-price.service.ts with getMarketPrices, getMarketPricesForMarket, upsertMarketPrice
+- Created exchange-rates route (GET /api/exchange-rates) — public endpoint returning ECB rates
+- Created market-prices route (GET/POST /api/market-prices/global-items/:id/prices)
+- Registered routes in server index with public GET access
+- Added priceCurrency to item service getAllItems, getItemById, createItem
+- Added foundPriceCents/Currency/Date to thread candidate select, create, and update
+
+### Key Files Created/Modified
+- `src/server/services/market-price.service.ts` — Market price CRUD
+- `src/server/routes/exchange-rates.ts` — Exchange rates endpoint
+- `src/server/routes/market-prices.ts` — Market prices API
+- `src/server/index.ts` — Route registration + public access
+- `src/server/services/item.service.ts` — priceCurrency in selects/create
+- `src/server/services/thread.service.ts` — foundPrice fields in candidate operations
+
+## Self-Check: PASSED
+- [x] Exchange rates endpoint created
+- [x] Market prices CRUD endpoints created
+- [x] Item responses include priceCurrency
+- [x] Candidate responses include foundPrice fields