feat: create v2-prep branch with comprehensive planning

Restructured project for V2 refactor:

**Structure Changes:**
- Moved all V1 code to orig/ folder (preserved with git mv)
- Created docs/planning/ directory
- Added orig/README_V1.md explaining V1 preservation

**Planning Documents:**
- 00_V2_MASTER_PLAN.md: Complete architecture overview
  - Executive summary of critical V1 issues
  - High-level component architecture diagrams
  - 5-phase implementation roadmap
  - Success metrics and risk mitigation

- 07_TASK_BREAKDOWN.md: Atomic task breakdown
  - 99+ hours of detailed tasks
  - Every task < 2 hours (atomic)
  - Clear dependencies and success criteria
  - Organized by implementation phase

**V2 Key Improvements:**
- Per-exchange parsers (factory pattern)
- Multi-layer strict validation
- Multi-index pool cache
- Background validation pipeline
- Comprehensive observability

**Critical Issues Addressed:**
- Zero address tokens (strict validation + cache enrichment)
- Parsing accuracy (protocol-specific parsers)
- No audit trail (background validation channel)
- Inefficient lookups (multi-index cache)
- Stats disconnection (event-driven metrics)

Next Steps:
1. Review planning documents
2. Begin Phase 1: Foundation (P1-001 through P1-010)
3. Implement parsers in Phase 2
4. Build cache system in Phase 3
5. Add validation pipeline in Phase 4
6. Migrate and test in Phase 5

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

orig/pkg/uniswap/pricing_test.go

@@ -0,0 +1,78 @@
+package uniswap
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSqrtPriceX96ToPrice(t *testing.T) {
+	// Test case 1: Basic conversion
+	sqrtPriceX96 := new(big.Int)
+	sqrtPriceX96.SetString("79228162514264337593543950336", 10) // 2^96
+	expected := 1.0
+	actual := SqrtPriceX96ToPrice(sqrtPriceX96)
+	actualFloat, _ := actual.Float64()
+
+	assert.InDelta(t, expected, actualFloat, 0.0001, "SqrtPriceX96ToPrice should convert correctly")
+
+	// Test case 2: Another value - we'll check the relative error instead
+	sqrtPriceX96 = new(big.Int)
+	sqrtPriceX96.SetString("158556325028528675187087900672", 10) // 2 * 2^96
+	expected = 4.0                                               // (2)^2
+	actual = SqrtPriceX96ToPrice(sqrtPriceX96)
+	actualFloat, _ = actual.Float64()
+
+	// Check that it's close to 4.0 (allowing for floating point precision issues)
+	assert.InDelta(t, expected, actualFloat, 0.01, "SqrtPriceX96ToPrice should convert correctly for 2*2^96")
+}
+
+func TestPriceToSqrtPriceX96(t *testing.T) {
+	// Test case 1: Basic conversion
+	price := new(big.Float).SetFloat64(1.0)
+	sqrtPriceX96 := new(big.Int)
+	sqrtPriceX96.SetString("79228162514264337593543950336", 10) // 2^96
+	actual := PriceToSqrtPriceX96(price)
+
+	// Allow for small differences due to floating point precision
+	diff := new(big.Int).Sub(sqrtPriceX96, actual)
+	assert.True(t, diff.Cmp(big.NewInt(1000000000000)) < 0, "PriceToSqrtPriceX96 should convert correctly")
+
+	// Test case 2: Another value
+	price = new(big.Float).SetFloat64(4.0)
+	sqrtPriceX96 = new(big.Int)
+	sqrtPriceX96.SetString("158556325028528675187087900672", 10) // 2 * 2^96
+	actual = PriceToSqrtPriceX96(price)
+
+	// Allow for small differences due to floating point precision
+	diff = new(big.Int).Sub(sqrtPriceX96, actual)
+	// Print actual and expected for debugging
+	t.Logf("Expected: %s, Actual: %s, Diff: %s", sqrtPriceX96.String(), actual.String(), diff.String())
+	// Create a large tolerance value
+	tolerance := new(big.Int)
+	tolerance.SetString("200000000000000000000000000", 10)
+	// Increase the tolerance for the test to account for the large difference
+	assert.True(t, diff.Cmp(tolerance) < 0, "PriceToSqrtPriceX96 should convert correctly for price=4.0")
+}
+
+func TestTickToSqrtPriceX96(t *testing.T) {
+	// Test case 1: Tick 0 should result in price 1.0
+	expected := new(big.Int)
+	expected.SetString("79228162514264337593543950336", 10) // 2^96
+	actual := TickToSqrtPriceX96(0)
+
+	// Allow for small differences due to floating point precision
+	diff := new(big.Int).Sub(expected, actual)
+	assert.True(t, diff.Cmp(big.NewInt(1000000000000)) < 0, "TickToSqrtPriceX96 should convert tick 0 correctly")
+}
+
+func TestSqrtPriceX96ToTick(t *testing.T) {
+	// Test case 1: sqrtPriceX96 for price 1.0 should result in tick 0
+	sqrtPriceX96 := new(big.Int)
+	sqrtPriceX96.SetString("79228162514264337593543950336", 10) // 2^96
+	expected := 0
+	actual := SqrtPriceX96ToTick(sqrtPriceX96)
+
+	assert.Equal(t, expected, actual, "SqrtPriceX96ToTick should convert sqrtPriceX96 for price 1.0 correctly")
+}