chore: release v2.15.2 with 100% test coverage

- Bump version to 2.15.2
- Add comprehensive changelog entry documenting all improvements
- Add 31 new unit tests achieving 100% coverage for changed code
- Fix flaky integration tests with deterministic ordering

Test Coverage Improvements:
- buildMetadataFilterConditions: All filter combinations (11 tests)
- Performance logging validation (3 tests)
- ID filtering edge cases (7 tests)
- getMetadataSearchCount: Shared helper usage (7 tests)
- Two-phase optimization verification (3 tests)

Coverage increased from 36.58% to 100% for patch

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

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

CHANGELOG.md

@@ -5,6 +5,42 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.15.2] - 2025-10-03
+
+### Fixed
+- **Template Search Performance & Reliability** - Enhanced `search_templates_by_metadata` with production-ready improvements
+  - **Ordering Stability**: Implemented CTE with VALUES clause to preserve exact Phase 1 ordering
+    - Prevents ordering discrepancies between ID selection and data fetch phases
+    - Ensures deterministic results across query phases
+  - **Defensive ID Validation**: Added type safety filters before Phase 2 query
+    - Validates only positive integers are used in the CTE
+    - Logs warnings for filtered invalid IDs
+  - **Performance Monitoring**: Added detailed timing metrics (phase1Ms, phase2Ms, totalMs)
+    - Enables quantifying optimization benefits
+    - Debug logging for all search operations
+  - **DRY Refactoring**: Extracted `buildMetadataFilterConditions` helper method
+    - Eliminates duplication between `searchTemplatesByMetadata` and `getMetadataSearchCount`
+    - Centralized filter-building logic
+
+### Added
+- **Comprehensive Test Coverage** - 31 new unit tests achieving 100% coverage for changed code
+  - `buildMetadataFilterConditions` - All filter combinations (11 tests)
+  - Performance logging validation (3 tests)
+  - ID filtering edge cases - negative, zero, non-integer, null (7 tests)
+  - `getMetadataSearchCount` - Shared helper usage (7 tests)
+  - Two-phase query optimization verification (3 tests)
+- Fixed flaky integration tests with deterministic ordering using unique view counts
+
+### Performance
+- Query optimization maintains sub-1ms Phase 1 performance
+- Two-phase approach prevents timeout on large template sets
+- CTE-based ordering adds negligible overhead (<1ms)
+
+### Test Results
+- Unit tests: 31 new tests, all passing
+- Integration tests: 36 passing, 1 skipped
+- **Coverage**: 100% for changed code (previously 36.58% patch coverage)
+
 ## [2.15.0] - 2025-10-02
 
 ### 🚀 Major Features