feat(testing): add SQLx/Rust test framework infrastructure

Add comprehensive Rust/SQLx testing infrastructure to replace pgTAP:

**Core Framework:**
- Create tests/sqlx crate with fluent assertion API
- Add selector constants to eliminate magic string literals
- Implement query assertion builder for ergonomic test writing

**Test Infrastructure:**
- Add SQLx migrations for EQL installation and test helpers
- Add SQL fixtures for test data seeding
- Configure Cargo workspace integration

**Tooling & Scripts:**
- Add mise tasks for test execution and coverage tracking
- Add assertion counting and comparison tools
- Add function call tracking for coverage analysis
- Add test inventory generator
- Add master coverage check script

**Configuration:**
- Update Docker Compose with track_functions enabled
- Add generated migration files to gitignore
- Update mise.toml with Rust test tasks

**Migration:**
- Remove pgTAP testing infrastructure (Dockerfile, tests, scripts)
- Add SQL-to-SQLx migration guide documentation
- Add assertion count and test inventory docs

This infrastructure enables writing Rust tests with SQLx queries instead
of pgTAP, providing better IDE support, type safety, and debugging.

Author: tobyhede

.gitignore

@@ -206,4 +206,7 @@ release/
 __pycache__
 
 # dbdev
-eql--*.sql
+eql--*.sql
+
+# Generated SQLx migration (built from src/, never commit)
+tests/sqlx/migrations/001_install_eql.sql

docs/assertion-counts.md

@@ -0,0 +1,57 @@
+# Assertion Count Report
+
+Generated: 2025-10-24
+
+# SQL Test Assertions
+
+| File | ASSERT | PERFORM assert_* | SELECT checks | Total |
+|------|--------|------------------|---------------|-------|
+| `src/blake3/compare_test.sql` | 9 | 0 | 0 | 9 |
+| `src/bloom_filter/functions_test.sql` | 0 | 2 | 0 | 2 |
+| `src/config/config_test.sql` | 26 | 4 | 11 | 41 |
+| `src/encrypted/aggregates_test.sql` | 4 | 0 | 2 | 6 |
+| `src/encrypted/constraints_test.sql` | 0 | 6 | 0 | 6 |
+| `src/encryptindex/functions_test.sql` | 21 | 1 | 19 | 41 |
+| `src/hmac_256/compare_test.sql` | 9 | 0 | 0 | 9 |
+| `src/hmac_256/functions_test.sql` | 1 | 2 | 0 | 3 |
+| `src/jsonb/functions_test.sql` | 4 | 24 | 0 | 28 |
+| `src/operators/->>_test.sql` | 0 | 6 | 0 | 6 |
+| `src/operators/->_test.sql` | 2 | 9 | 0 | 11 |
+| `src/operators/<=_ore_cllw_u64_8_test.sql` | 0 | 3 | 3 | 6 |
+| `src/operators/<=_ore_cllw_var_8_test.sql` | 0 | 3 | 3 | 6 |
+| `src/operators/<=_test.sql` | 0 | 8 | 4 | 12 |
+| `src/operators/<>_ore_cllw_u64_8_test.sql` | 0 | 3 | 0 | 3 |
+| `src/operators/<>_ore_cllw_var_8_test.sql` | 0 | 3 | 0 | 3 |
+| `src/operators/<>_ore_test.sql` | 0 | 8 | 0 | 8 |
+| `src/operators/<>_test.sql` | 0 | 12 | 2 | 14 |
+| `src/operators/<@_test.sql` | 0 | 2 | 0 | 2 |
+| `src/operators/<_test.sql` | 0 | 12 | 1 | 13 |
+| `src/operators/=_ore_cllw_u64_8_test.sql` | 0 | 3 | 3 | 6 |
+| `src/operators/=_ore_cllw_var_8_test.sql` | 0 | 3 | 3 | 6 |
+| `src/operators/=_ore_test.sql` | 0 | 8 | 4 | 12 |
+| `src/operators/=_test.sql` | 0 | 16 | 12 | 28 |
+| `src/operators/>=_test.sql` | 0 | 14 | 10 | 24 |
+| `src/operators/>_test.sql` | 0 | 12 | 1 | 13 |
+| `src/operators/@>_test.sql` | 4 | 2 | 0 | 6 |
+| `src/operators/compare_test.sql` | 63 | 0 | 0 | 63 |
+| `src/operators/operator_class_test.sql` | 16 | 1 | 24 | 41 |
+| `src/operators/order_by_test.sql` | 0 | 16 | 4 | 20 |
+| `src/operators/~~_test.sql` | 0 | 10 | 0 | 10 |
+| `src/ore_block_u64_8_256/compare_test.sql` | 9 | 0 | 0 | 9 |
+| `src/ore_block_u64_8_256/functions_test.sql` | 1 | 5 | 2 | 8 |
+| `src/ore_cllw_u64_8/compare_test.sql` | 9 | 0 | 0 | 9 |
+| `src/ore_cllw_var_8/compare_test.sql` | 9 | 0 | 0 | 9 |
+| `src/ore_cllw_var_8/functions_test.sql` | 0 | 0 | 0 | 0 |
+| `src/ste_vec/functions_test.sql` | 18 | 0 | 0 | 18 |
+| `src/version_test.sql` | 0 | 1 | 1 | 2 |
+
+**Total SQL assertions:** 513 across 38 files
+
+# Rust Test Assertions
+
+| File | assert* | expect* | is_err/is_ok | Total |
+|------|---------|---------|--------------|-------|
+| `rust-tests/tests/add_column_test.rs` | 0 | 0 | 0 | 0 |
+| `rust-tests/tests/test_helpers_test.rs` | 0 | 0 | 0 | 0 |
+
+**Total Rust assertions:** 0 across 2 files