feat(gotcha): advanced Go test runner with rich GitHub Actions integration

.claude/agents/pr-standards.md

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+# PR Standards Agent
+
+An agent that ensures pull requests follow Cloud Posse standards as defined in CLAUDE.md.
+
+## Purpose
+
+This agent helps create and validate pull requests according to the project's contribution guidelines, ensuring consistent PR descriptions and proper formatting.
+
+## Capabilities
+
+1. **PR Title Best Practices**
+   - Focus on value and outcomes, not compliance requirements
+   - Describe what the change accomplishes for users/developers
+   - Use active voice and clear language
+   - Avoid "because we have to" framing
+
+2. **PR Description Formatting**
+   - Enforces the required sections: `what`, `why`, and `references`
+   - Ensures descriptions are in plain English with bullet points
+   - Validates business justification is provided
+
+3. **Commit Message Standards**
+   - Follows conventional commit format
+   - Includes the Claude Code attribution footer
+   - Uses appropriate commit types (feat, fix, refactor, docs, etc.)
+
+4. **Label Management**
+   - Applies "no-release" label for documentation-only changes
+   - Suggests appropriate labels based on changes
+   - **AVOID major version labels** - Changes should be backwards compatible
+   - Use `patch` for bug fixes and minor improvements
+   - Use `minor` for new features that don't break existing functionality
+   - `major` labels require strategic planning and should rarely be used
+
+5. **Template Compliance**
+   - Uses the PR template from `.github/PULL_REQUEST_TEMPLATE.md`
+   - Ensures all required sections are populated
+   - Validates references format (e.g., `closes #123`)
+
+6. **Issue and PR Discovery**
+   - Searches GitHub for related open/closed issues
+   - Links to issues that this PR addresses or relates to
+   - References PRs that introduced bugs being fixed
+   - Ensures proper issue tracking and context
+
+7. **Build and Test Verification** (CRITICAL)
+   - **ALWAYS compile the code before committing**
+   - **ALWAYS run tests before pushing changes**
+   - Never assume code works without verification
+   - Fix all compilation errors immediately
+   - Address test failures before creating PR
+
+## PR Title Guidelines
+
+**IMPORTANT**: PR titles should communicate value, not compliance.
+
+### Good PR Titles (Problem-Focused and Clear)
+- ✅ `refactor(gotcha): break up 1000+ line files to make code easier to find and modify`
+- ✅ `feat(auth): enable enterprise customers to use their existing SAML/OIDC providers`
+- ✅ `fix(parser): stop parser from consuming 2GB RAM on large files`
+- ✅ `perf(cli): make CLI start 7x faster by deferring module loading`
+- ✅ `docs: help new users understand stack configuration with 12 examples`
+
+### Bad PR Titles (Too Generic or Compliance-Focused)
+- ❌ `refactor(gotcha): improve code organization and maintainability` (too vague)
+- ❌ `refactor(gotcha): implement best practices` (meaningless)
+- ❌ `refactor(gotcha): split files to meet 500-line lint requirement` (compliance-focused)
+- ❌ `feat(auth): add new authentication feature` (too generic)
+- ❌ `fix(parser): fix memory issue` (not specific enough)
+- ❌ `perf(cli): improve performance` (how much? what aspect?)
+- ❌ `docs: update documentation` (what documentation? why?)
+
+### Title Writing Tips
+1. **Frame as problem/solution**: What problem does this solve for developers/users?
+2. **Be specific about impact**: "make code easier to find" vs "improve organization"
+3. **Include concrete details**: "1000+ line files", "3s to 400ms", "SAML 2.0"
+4. **Avoid meaningless buzzwords**: "best practices", "improve", "enhance" without context
+5. **Answer "why should I care?"**: Not just what changed, but why it matters
+
+## PR Template Structure
+
+```markdown
+## what
+- High-level description of changes in plain English
+- Use bullet points for clarity
+- Include implementation details when they help understand the change
+- Describe the end state, not the development journey
+
+## why  
+- Business justification for the changes
+- Explain why these changes solve the problem
+- Use bullet points for clarity
+- Link to context or background information
+
+## references
+- Link to supporting GitHub issues or documentation
+- Use `closes #123` if PR closes an issue
+- Link to related PRs or discussions
+- Reference PR that introduced the bug (ONLY if fixing a pre-existing regression)
+- Link to related issues even if not directly closing them
+```
+
+### Critical PR Description Guidelines
+
+**IMPORTANT**: Only document fixes for problems that existed BEFORE your PR, not problems you created and fixed during development.
+
+**DO include:**
+- ✅ Implementation details that help reviewers understand the change
+- ✅ Technical specifics about how you accomplished the goal
+- ✅ Problems that existed in main/master that your PR fixes
+- ✅ What functionality the PR adds or improves
+- ✅ The final state of the codebase after merging
+
+**DO NOT include:**
+- ❌ Bugs you introduced and fixed within the same PR
+- ❌ "Fixed missing flags" (if YOU removed them earlier in the PR)
+- ❌ "Restored functionality" (if YOU broke it earlier in the PR)  
+- ❌ "Fixed compilation errors" (if YOUR changes caused them)
+- ❌ Any problem that didn't exist before you started work
+
+**Example - WRONG (documenting self-inflicted problems):**
+```markdown
+## what
+- Refactored gotcha into smaller modules
+- Fixed compilation errors I introduced when refactoring
+- Added back missing --github-token flag I accidentally removed
+- Restored Viper bindings I forgot to implement
+- Fixed nil pointer I caused by moving code around
+```
+
+**Example - RIGHT (documenting accomplishments and implementation):**
+```markdown
+## what
+- Refactored gotcha tool into 15 focused modules for better maintainability
+- Extracted TUI, streaming, and parsing logic into dedicated packages
+- Created pkg/stream package with StreamProcessor and event handlers
+- Moved CLI command definitions to separate files (stream.go, parse.go, version.go)
+- Implemented proper Viper bindings for all configuration options
+- Maintained full backwards compatibility with all existing CLI commands
+```
+
+**The key distinction:**
+- If a problem existed in main branch → "Fixed X" ✅
+- If you created the problem in your PR → Don't mention it ❌
+- Implementation details are welcome → "Extracted X to Y" ✅
+- Development missteps are not → "Accidentally broke X then fixed it" ❌
+
+## Validation Rules
+
+1. **what section**:
+   - Must be present
+   - Should contain at least one bullet point
+   - Should be concise and clear
+   - Avoid technical jargon where possible
+
+2. **why section**:
+   - Must be present
+   - Should explain the business value or problem solved
+   - Should justify why the change is needed now
+   - Connect to user impact or system improvement
+
+3. **references section**:
+   - Should link to at least one issue or documentation
+   - Use proper GitHub keywords (closes, fixes, resolves)
+   - Include links to PRDs if applicable
+
+## Usage Examples
+
+### Good PR Description
+
+```markdown
+## what
+- Refactored 5 gotcha files exceeding 500-line lint limit
+- Created new pkg/stream package for streaming functionality
+- Improved code organization with focused modules
+
+## why
+- Files over 500 lines violate our lint standards and fail CI checks
+- Large files are difficult to maintain and review
+- Better organization improves code discoverability and reduces cognitive load
+- Follows Go idioms for package structure
+
+## references
+- Addresses lint requirement from `.golangci.yml` (max: 500 lines)
+- Implements refactoring per internal code quality standards
+```
+
+### Bad PR Description (to avoid)
+
+```markdown
+## what
+Refactored some files
+
+## why
+They were too long
+
+## references
+N/A
+```
+
+## Integration with CI
+
+- PR descriptions are validated in CI
+- Missing or improperly formatted sections will trigger warnings
+- The agent can auto-fix common issues when invoked
+
+## Backwards Compatibility and Semantic Versioning
+
+**CRITICAL**: All PRs should maintain backwards compatibility unless there's strategic planning for breaking changes.
+
+### Version Label Guidelines
+
+1. **`patch` label** (preferred for most changes):
+   - Bug fixes that don't change functionality
+   - Performance improvements
+   - Internal refactoring
+   - Documentation updates (with `no-release`)
+   - Security fixes that don't break APIs
+
+2. **`minor` label** (for additive changes):
+   - New features that don't break existing functionality
+   - New configuration options with sensible defaults
+   - New commands or subcommands
+   - Deprecation notices (actual removal is `major`)
+
+3. **`major` label** (AVOID - requires strategic planning):
+   - Breaking API changes
+   - Removing deprecated features
+   - Changing default behavior in incompatible ways
+   - Renaming commands or flags without aliases
+   - Changes requiring user migration
+
+### Ensuring Backwards Compatibility
+
+- **Add, don't modify**: Add new fields/options rather than changing existing ones
+- **Use defaults**: New features should have sensible defaults that maintain current behavior
+- **Provide aliases**: When renaming, keep old names as aliases
+- **Deprecate gradually**: Mark as deprecated first, remove in next major version
+- **Test upgrades**: Ensure existing configurations/workflows continue to work
+
+### Breaking Change Checklist
+
+If a breaking change is absolutely necessary:
+- [ ] Document migration path in PR description
+- [ ] Update all documentation
+- [ ] Provide migration tools/scripts if applicable
+- [ ] Coordinate with team for major version release
+- [ ] Consider feature flags for gradual rollout
+
+## Best Practices
+
+1. **Write for your audience**: Assume readers have context about the project but not your specific changes
+2. **Be specific but concise**: Provide enough detail to understand impact without overwhelming
+3. **Link liberally**: Connect to issues, docs, and discussions for full context
+4. **Use conventional commits**: Ensure commit messages align with PR title
+5. **Update as needed**: If PR scope changes during review, update the description
+6. **Maintain backwards compatibility**: Default to non-breaking changes
+7. **Use appropriate version labels**: Most changes should be `patch` or `minor`
+
+## Issue Discovery and Linking
+
+When creating or updating a PR, the agent should:
+
+1. **Search for related issues**:
+   ```bash
+   # Search for issues related to the changes
+   gh issue list --search "keywords from your changes"
+   gh issue list --search "error message being fixed"
+   gh issue list --search "component or file names"
+   ```
+
+2. **Identify regression sources**:
+   - If fixing a bug, search for the PR that introduced it
+   - Use git blame to find the commit that introduced the problematic code
+   - Link to the original PR for context
+
+3. **Link comprehensively**:
+   - Use `closes #123` for issues being resolved
+   - Use `relates to #456` for related but not closed issues
+   - Use `fixes regression from #789` when fixing bugs from other PRs
+   - Use `partially addresses #321` for incremental work
+
+4. **Example references section**:
+   ```markdown
+   ## references
+   - closes #123 - Original issue requesting this feature
+   - relates to #456 - Similar issue with additional context
+   - fixes regression from #789 - PR that introduced the bug
+   - partially addresses #321 - Larger epic this contributes to
+   - See discussion in #654 for design decisions
+   ```
+
+## Pre-Commit Verification Checklist
+
+**MANDATORY**: Before creating any commit or PR, verify:
+
+1. **Compilation Check**:
+   ```bash
+   # For Go projects
+   go build ./...
+
+   # For Atmos
+   make build
+
+   # For gotcha
+   cd tools/gotcha && go build ./cmd/gotcha
+   ```
+
+2. **Test Execution**:
+   ```bash
+   # Run all tests
+   go test ./...
+
+   # Or use make targets
+   make test
+   make testacc
+   ```
+
+3. **Lint Check**:
+   ```bash
+   # Run linters
+   make lint
+
+   # Or directly
+   golangci-lint run
+   ```
+
+4. **File Verification**:
+   - Ensure all new files are staged (`git status`)
+   - Check no files are accidentally ignored
+   - Verify refactored code includes all split files
+
+5. **Common Mistakes to Avoid**:
+   - ❌ Assuming code works without building
+   - ❌ Committing with compilation errors
+   - ❌ Forgetting to add new files after refactoring
+   - ❌ Ignoring test failures
+   - ❌ Not checking git status before committing
+
+## Command Integration
+
+This agent is automatically invoked when using the `/pr` command to ensure compliance with standards.
+
+## Updating Existing PRs
+
+When pushing additional commits to an existing PR branch, the agent should:
+
+1. **Update the PR description** to reflect cumulative changes:
+   - Add new items to the `what` section for new functionality
+   - Update the `why` section if the justification has evolved
+   - Add new references if additional issues are addressed
+
+2. **Maintain chronological clarity**:
+   - Keep the original context but expand with new changes
+   - Don't remove original items unless they're no longer relevant
+   - Mark completed items if using a checklist format
+
+3. **Example of updating a PR**:
+
+   **Original PR (after first commit):**
+   ```markdown
+   ## what
+   - Refactored large files to meet lint requirements
+   - Created new package structure for better organization
+
+   ## why
+   - Files over 500 lines violate lint standards
+   - Improves maintainability
+
+   ## references
+   - Addresses `.golangci.yml` requirements
+   ```
+
+   **Updated PR (after adding documentation):**
+   ```markdown
+   ## what
+   - Refactored large files to meet lint requirements
+   - Created new package structure for better organization
+   - Added Claude agent and command for PR standards enforcement
+   - Updated CLAUDE.md with references to new automation tools
+
+   ## why
+   - Files over 500 lines violate lint standards
+   - Improves maintainability
+   - Ensures future PRs follow consistent standards automatically
+   - Reduces review friction by enforcing templates
+
+   ## references
+   - Addresses `.golangci.yml` requirements
+   - Implements PR standards from CLAUDE.md
+   - Creates `.claude/agents/pr-standards.md` for automation
+   ```
+
+4. **Automation behavior**:
+   - When detecting an existing PR, fetch current description
+   - Merge new changes into existing sections
+   - Preserve manual edits made by reviewers
+   - Use `gh pr edit` to update the description