chore: release v6.5.0

- Bump version to 6.5.0
- Update CHANGELOG.md with comprehensive error logging feature
- Update README.md Recent Updates section with v6.5.0
- Update version references

Release: v6.5.0

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

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

Author: marcusgoll

CHANGELOG.md

@@ -2,6 +2,28 @@
 
 ---
 
+## [6.5.0] - 2025-11-18
+
+### Added
+- **Comprehensive Error Logging**: Implemented automatic error tracking during workflow execution
+  - Added native bash `mark-failed` function to task-tracker.sh
+  - Error-log.md now automatically populated during /implement phase
+  - Captures test failures, missing REUSE files, git conflicts, linting errors
+  - Specialist agents required to log errors BEFORE auto-rollback
+  - Resolves issue where error-log.md remained empty despite errors occurring
+
+### Fixed
+- **CI ShellCheck**: Excluded workflow instruction files from validation
+  - Workflow files (*-workflow.sh) are documentation, not executable scripts
+  - Added SC2004 to ShellCheck exclusions (cosmetic style warnings)
+
+### Technical Details
+- **task-tracker.sh**: Native bash implementation for mark-failed action with feature directory auto-detection
+- **implement-workflow.sh**: Updated specialist agent prompts with mandatory error logging instructions
+- **CI workflow**: Modified to exclude instruction files from ShellCheck and syntax validation
+
+---
+
 ## [6.4.1] - 2025-11-17
 
 ### Fixed

README.md

@@ -44,6 +44,29 @@
 
 ## 🆕 Recent Updates
 
+### v6.5.0 (November 2025)
+
+**Comprehensive Error Logging**
+
+- **Automatic Error Tracking**: Error-log.md now automatically populated during workflow execution
+  - Native bash `mark-failed` function in task-tracker.sh
+  - Specialist agents MUST log errors BEFORE auto-rollback
+  - Captures test failures, missing REUSE files, git conflicts, linting errors
+  - Structured format with timestamps, task IDs, and error details
+- **Mandatory Error Logging**: Updated specialist agent prompts in implement-workflow.sh
+  - All failure scenarios require error logging via task-tracker mark-failed
+  - Error capture integrated into auto-rollback logic
+  - Continue to next task after logging (fail gracefully)
+- **CI ShellCheck Fixes**: Excluded workflow instruction files from validation
+  - Workflow files (*-workflow.sh) are documentation, not executable bash scripts
+  - Added SC2004 to exclusions (cosmetic style warnings)
+
+**Problem Solved**: Error-log.md files were created with comprehensive templates during /plan phase but remained empty during workflow execution. Only /debug command and PowerShell task-tracker actually wrote to error-log.md, meaning errors during /implement were lost.
+
+**Impact**: All failures during workflow execution are now automatically logged to error-log.md with full context. Debugging is dramatically faster with complete error history. Specialist agents fail gracefully with proper error tracking.
+
+---
+
 ### v6.4.1 (November 2025)
 
 **Windows Compatibility Fix**

package.json

@@ -1,6 +1,6 @@
 {
   "name": "spec-flow",
-  "version": "6.4.1",
+  "version": "6.5.0",
   "description": "Spec-Driven Development workflow toolkit for Claude Code - Build high-quality features faster with repeatable AI workflows",
   "keywords": [
     "claude",