docs: add bulk_update_tasks to CHANGELOG.md

- Add Bulk Task Updates feature to Unreleased/Added section
- Include comprehensive details: 70-95% savings, partial updates, atomic operation
- Update tool count: 38 total tools (Task Management now 8 tools)
- Add performance metrics: 10-task and 20-task savings examples
- Note comprehensive test coverage (23 tests)

Relates to task 42b48870-d541-420a-a95c-da10cafce048

Author: jpicklyk

CHANGELOG.md

@@ -8,6 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+- **Bulk Task Updates** - Efficient multi-task update operation
+  - `bulk_update_tasks` tool for updating 3-100 tasks in single operation
+  - 70-95% token savings vs individual update_task calls
+  - Supports partial updates (each task updates only specified fields)
+  - Atomic operation with detailed success/failure reporting
+  - Example: 10-task update saves 11,850 characters (95% reduction)
+  - Comprehensive test suite with 23 tests covering validation, happy paths, errors, and performance
 - **Template Caching** - In-memory caching for template operations
   - CachedTemplateRepository decorator wraps SQLiteTemplateRepository
   - Caches individual templates, template lists, and template sections
@@ -34,10 +41,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Removed `includeMarkdownView` parameter from get_task, get_feature, and get_project tools
-- Updated API reference documentation to reflect 40 total tools (was 37)
-- Updated tool category counts: Task Management (7 tools), Feature Management (6 tools), Project Management (6 tools)
+- Updated API reference documentation to reflect 38 total tools (was 37)
+- Updated tool category counts: Task Management (8 tools, was 7), Feature Management (6 tools), Project Management (6 tools)
 
 ### Performance
+- Bulk task updates: 70-95% token reduction vs individual update_task calls
+  - 10 tasks: 95% savings (11,850 characters saved)
+  - 20 tasks: 95% savings (23,700 characters saved)
+  - Single database transaction vs multiple round-trips
 - V4 migration: Dependency lookups 5-10x faster with directional indexes
 - V4 migration: Search operations 2-5x faster with search vector indexes
 - V4 migration: Filtered queries 2-4x faster with composite indexes

CLAUDE.md

@@ -356,14 +356,4 @@ Last initialized: 2025-10-10
 - Write descriptive titles and summaries
 - Use appropriate complexity ratings (1-10)
 - Apply consistent tagging conventions
-- Include acceptance criteria in summaries
-
-**Bulk Operations** (Token Optimization):
-- Use `bulk_update_tasks` for 3+ task updates (70-95% savings)
-- Use `bulk_create_sections` for 2+ sections (preferred over multiple add_section)
-- Use `bulk_update_sections` for multiple section updates
-- Combine with search_tasks to find then bulk update
-- Examples:
-  - Feature completion: search + bulk update all tasks to completed
-  - Priority triage: find dependent tasks + bulk update priority
-  - Sprint planning: select pending tasks + bulk update to in-progress
+- Include acceptance criteria in summaries