docs: add releases/memory directory for changelog tracking

Added structured changelog documentation:
- Created releases/memory/ directory to track changes between tags
- Each version has a .md file (v1.2.1.md, etc.) documenting commits and impact
- Updated CLAUDE.md with release notes reference
- Updated README.md with releases section
- Updated .gitignore to track releases/memory/ while ignoring other release artifacts

This helps reviewers and developers understand changes between versions
before making new updates to the codebase.

Initial entry: v1.2.1.md documenting the pricelist refactor and
configurator component substitution fix.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

releases/memory/v1.2.1.md

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+# v1.2.1 Release Notes
+
+**Date:** 2026-02-09
+**Changes since v1.2.0:** 2 commits
+
+## Summary
+Fixed configurator component substitution by updating to work with new pricelist-based pricing model. Addresses regression from v1.2.0 refactor that removed `CurrentPrice` field from components.
+
+## Commits
+
+### 1. Refactor: Remove CurrentPrice from local_components (5984a57)
+**Type:** Refactor
+**Files Changed:** 11 files, +167 insertions, -194 deletions
+
+#### Overview
+Transitioned from component-based pricing to pricelist-based pricing model:
+- Removed `CurrentPrice` and `SyncedAt` from LocalComponent (metadata-only now)
+- Added `WarehousePricelistID` and `CompetitorPricelistID` to LocalConfiguration
+- Removed 2 unused methods: UpdateComponentPricesFromPricelist, EnsureComponentPricesFromPricelists
+
+#### Key Changes
+- **Data Model:**
+  - LocalComponent: now stores only metadata (LotName, LotDescription, Category, Model)
+  - LocalConfiguration: added warehouse and competitor pricelist references
+
+- **Migrations:**
+  - drop_component_unused_fields - removes CurrentPrice, SyncedAt columns
+  - add_warehouse_competitor_pricelists - adds new pricelist fields
+
+- **Quote Calculation:**
+  - Updated to use pricelist_items instead of component.CurrentPrice
+  - Added PricelistID field to QuoteRequest
+  - Maintains offline-first behavior
+
+- **API:**
+  - Removed CurrentPrice from ComponentView
+  - Components API no longer returns pricing
+
+### 2. Fix: Load component prices via API (acf7c8a)
+**Type:** Bug Fix
+**Files Changed:** 1 file (web/templates/index.html), +66 insertions, -12 deletions
+
+#### Problem
+After v1.2.0 refactor, the configurator's autocomplete was filtering out all components because it checked for the removed `current_price` field on component objects.
+
+#### Solution
+Implemented on-demand price loading via API:
+- Added `ensurePricesLoaded()` function to fetch prices from `/api/quote/price-levels`
+- Added `componentPricesCache` to cache loaded prices in memory
+- Updated all 3 autocomplete modes (single, multi, section) to load prices when input is focused
+- Changed price validation from `c.current_price` to `hasComponentPrice(lot_name)`
+- Updated cart item creation to use cached API prices
+
+#### Impact
+- Components without prices are still filtered out (as required)
+- Price checks now use API data instead of removed database field
+- Frontend loads prices on-demand for better performance
+
+## Testing Notes
+- ✅ Configurator component substitution now works
+- ✅ Prices load correctly from pricelist
+- ✅ Offline mode still supported (prices cached after initial load)
+- ✅ Multi-pricelist support functional (estimate/warehouse/competitor)
+
+## Known Issues
+None
+
+## Migration Path
+No database migration needed from v1.2.0 - migrations were applied in v1.2.0 release.
+
+## Breaking Changes
+None for end users. Internal: `ComponentView` no longer includes `CurrentPrice` in API responses.