chore: import upstream snapshot with attribution

cli-tool/components/commands/git-workflow/git-bisect-helper.md

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+---
+allowed-tools: Bash(git bisect:*), Bash(git log:*), Bash(git show:*), Bash(git checkout:*), Bash(npm:*), Bash(yarn:*), Bash(pnpm:*), Read, Edit, Grep
+argument-hint: [good-commit] [bad-commit] | --auto [test-command] | --reset | --continue
+description: Use PROACTIVELY to guide automated git bisect sessions for finding regression commits with smart test execution
+---
+
+# Git Bisect Helper & Automation
+
+Automated git bisect session to find regression commits: $ARGUMENTS
+
+## Current Repository State
+
+- Current branch: !`git branch --show-current`
+- Recent commits: !`git log --oneline -10`
+- Git status: !`git status --porcelain`
+- Bisect status: !`git bisect log 2>/dev/null || echo "No active bisect session"`
+- Available tags: !`git tag --sort=-version:refname | head -10`
+
+## Task
+
+Set up and manage an intelligent git bisect session to identify the exact commit that introduced a regression or bug.
+
+## Bisect Session Management
+
+### 1. Session Initialization
+- Analyze commit history to suggest good/bad commit candidates
+- Set up bisect session with appropriate range
+- Validate that the range actually contains the regression
+- Create backup branch before starting bisect
+
+### 2. Automatic Test Execution
+- Run specified test command at each bisect point
+- Interpret test results (exit codes, output patterns)
+- Automatically mark commits as good/bad based on test outcomes
+- Handle test environment setup/teardown
+
+### 3. Manual Verification Support
+- Provide clear instructions for manual testing at each step
+- Show relevant changes in current commit
+- Guide user through good/bad decision process
+- Maintain bisect log with detailed reasoning
+
+### 4. Smart Commit Analysis
+- Analyze commit messages for relevant keywords
+- Show file changes that might be related to the issue
+- Highlight suspicious patterns or large changes
+- Skip obviously unrelated commits when possible
+
+## Bisect Modes
+
+### Automatic Bisect (`--auto [test-command]`)
+```bash
+# Automatically bisect using test command
+/git-bisect-helper --auto "npm test"
+/git-bisect-helper --auto "python -m pytest tests/test_regression.py"
+/git-bisect-helper --auto "./scripts/check-performance.sh"
+```
+
+**Process:**
+1. Run test command at each bisect point
+2. Mark commit as good (exit code 0) or bad (non-zero)
+3. Continue until regression commit is found
+4. Provide detailed report of findings
+
+### Manual Guided Bisect
+```bash
+# Interactive bisect with guidance
+/git-bisect-helper v1.2.0 HEAD
+/git-bisect-helper abc123 def456
+```
+
+**Process:**
+1. Show current commit details and changes
+2. Provide testing suggestions
+3. Wait for user input (good/bad)
+4. Continue to next bisect point
+5. Offer insights about current commit
+
+### Continue Existing Session (`--continue`)
+```bash
+# Resume interrupted bisect session
+/git-bisect-helper --continue
+```
+
+**Process:**
+1. Analyze current bisect state
+2. Show progress and remaining steps
+3. Continue with appropriate mode
+4. Provide context from previous steps
+
+### Reset Session (`--reset`)
+```bash
+# Clean up and reset bisect session
+/git-bisect-helper --reset
+```
+
+**Process:**
+1. End current bisect session
+2. Return to original branch
+3. Clean up temporary files
+4. Provide session summary
+
+## Intelligent Test Execution
+
+### Test Environment Detection
+- **Node.js**: Detect package.json and run appropriate package manager
+- **Python**: Identify requirements.txt, setup.py, pyproject.toml
+- **Ruby**: Look for Gemfile and use bundler
+- **Java**: Detect Maven (pom.xml) or Gradle (build.gradle)
+- **Go**: Identify go.mod and use go test
+- **Rust**: Detect Cargo.toml and use cargo test
+
+### Build System Integration
+- Run build process before testing if needed
+- Handle dependency installation for older commits
+- Manage environment variable requirements
+- Skip build for commits that don't compile (mark as bad)
+
+### Test Result Interpretation
+- Parse test output for meaningful error patterns
+- Distinguish between test failures and environment issues
+- Handle flaky tests with retry logic
+- Provide confidence levels for automated decisions
+
+## Commit Analysis Features
+
+### Change Impact Assessment
+```bash
+# Analyze current bisect commit
+Files changed: !`git show --name-only --pretty="" HEAD`
+Commit message: !`git log -1 --pretty=format:"%s"`
+Author and date: !`git log -1 --pretty=format:"%an (%ar)"`
+```
+
+### Regression Pattern Detection
+- Identify commits touching critical areas
+- Flag commits with suspicious change patterns
+- Highlight performance-related modifications
+- Detect dependency or configuration changes
+
+### Context Preservation
+- Maintain detailed log of bisect decisions
+- Record reasoning for each good/bad marking
+- Save test outputs for later analysis
+- Document environmental factors
+
+## Advanced Bisect Strategies
+
+### Skip Strategy for Build Issues
+- Automatically skip commits that don't compile
+- Handle dependency version conflicts
+- Skip commits with known build system issues
+- Focus bisect on functional commits only
+
+### Performance Regression Detection
+- Use performance benchmarks instead of pass/fail tests
+- Set acceptable performance thresholds
+- Track performance trends across commits
+- Identify performance cliff points
+
+### Multi-criteria Bisecting
+- Test multiple aspects simultaneously
+- Handle cases where good/bad isn't binary
+- Support complex regression scenarios
+- Provide weighted decision making
+
+## Bisect Session Reporting
+
+### Progress Tracking
+```
+Bisect Progress:
+🎯 Target: Find regression in user authentication
+📊 Commits remaining: ~4 (out of 127)
+⏱️  Estimated time: 8 minutes
+🔍 Current commit: abc123 - "refactor auth middleware"
+```
+
+### Final Report
+```
+🎉 Regression Found!
+
+Bad Commit: def456
+Author: John Doe
+Date: 2024-01-15 14:30:00
+Message: "optimize database queries"
+
+Files Changed:
+- src/auth/database.js
+- src/middleware/auth.js
+- tests/auth.test.js
+
+Bisect Log: 15 steps, 3 manual verifications
+Total Time: 12 minutes
+
+Recovery Commands:
+git revert def456                    # Revert the problematic commit
+git cherry-pick def456^..def456~1    # Cherry-pick the good parts
+```
+
+## Integration with Development Workflow
+
+### CI/CD Integration
+- Use same test commands as CI pipeline
+- Respect CI environment variables
+- Handle containerized test environments
+- Integrate with existing quality gates
+
+### Team Collaboration
+- Share bisect sessions with team members
+- Document findings in issue tracking
+- Create reproducible bisect scripts
+- Establish team bisect best practices
+
+### Debugging Enhancement
+- Generate debug reports for problematic commits
+- Create minimal reproduction cases
+- Suggest fix approaches based on regression type
+- Link to relevant documentation or similar issues
+
+## Safety and Recovery
+
+### Session Backup
+- Create backup branch before starting
+- Save original HEAD position
+- Maintain recovery information
+- Handle interrupted sessions gracefully
+
+### Error Handling
+- Recover from corrupted bisect state
+- Handle repository state conflicts
+- Manage disk space issues during long bisects
+- Provide clear error messages and solutions
+
+## Example Workflows
+
+### Performance Regression
+```bash
+# Find when tests became slower
+/git-bisect-helper --auto "timeout 30s npm test"
+```
+
+### Feature Regression  
+```bash
+# Find when feature X broke
+/git-bisect-helper --auto "./test-feature-x.sh"
+```
+
+### Build Regression
+```bash
+# Find when build started failing
+/git-bisect-helper --auto "npm run build"
+```
+
+### Manual Investigation
+```bash
+# Interactive bisect for complex issues
+/git-bisect-helper v2.1.0 HEAD
+```
+
+The bisect helper provides intelligent automation while maintaining full control over the debugging process, making regression hunting efficient and systematic.