feat: add hello world file with PRP documentation

PRPs/features/completed/create-hello-world-1-file.md

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+# Feature: Create Hello World File 1
+
+## Feature Description
+
+Create a simple text file named `hello-world-1.txt` in the root directory of the repository containing the text "Hello from parallel work order 1!". This feature serves as a demonstration of basic file creation functionality and can be used for testing parallel work order execution systems.
+
+## User Story
+
+As a developer testing parallel work order systems
+I want to create a simple hello world text file in the root directory
+So that I can verify that basic file creation operations work correctly and that work orders can execute independently
+
+## Problem Statement
+
+When testing parallel work order execution systems or demonstrating basic file operations, there is a need for simple, non-conflicting tasks that can be executed independently. Creating individual text files with unique content provides an ideal test case for:
+
+- Verifying file system write operations
+- Testing parallel execution without file conflicts
+- Demonstrating successful task completion
+- Validating work order isolation
+
+## Solution Statement
+
+Create a straightforward Python script or direct file operation that writes a text file to the root directory with predefined content. This solution requires no dependencies, no complex logic, and can be validated with a simple file existence and content check. The implementation will follow KISS and YAGNI principles by avoiding unnecessary complexity.
+
+## Relevant Files
+
+This is a simple file creation task that requires no existing files to be modified. The implementation will create a new file directly.
+
+### New Files
+
+- `hello-world-1.txt` - Root directory text file containing "Hello from parallel work order 1!"
+  - Location: `/tmp/agent-work-orders/repos/f4f3fd91/trees/sandbox-wo-c9e597d7/hello-world-1.txt`
+  - Purpose: Demonstrate successful file creation as part of parallel work order testing
+
+### Reference Files
+
+- `CLAUDE.md:5-21` - Core principles (KISS, YAGNI) and project conventions
+  - Relevant because: Guides us to keep the implementation simple and avoid over-engineering
+
+## Relevant Research Documentation
+
+This is a basic file operation that doesn't require external libraries or documentation. Standard Python file I/O or shell commands are sufficient:
+
+- [Python Built-in Functions - open()](https://docs.python.org/3/library/functions.html#open)
+  - `#open-function`
+  - Built-in Python function for file operations
+- [Bash File Operations](https://www.gnu.org/software/bash/manual/bash.html#Redirections)
+  - `#redirections`
+  - Alternative approach using shell redirection
+
+## Implementation Plan
+
+### Phase 1: Foundation
+
+No foundational work is needed for this simple file creation task. The repository structure already exists, and we only need to create a single text file.
+
+### Phase 2: Core Implementation
+
+Create the `hello-world-1.txt` file in the root directory with the specified content. This can be accomplished using either:
+1. Python's built-in file I/O operations
+2. Shell command (echo with output redirection)
+3. Claude Code's Write tool (preferred for this context)
+
+### Phase 3: Integration
+
+No integration is required. This is a standalone file that doesn't interact with any existing functionality in the codebase.
+
+## Step by Step Tasks
+
+### Task 1: Create the hello-world-1.txt file
+
+- Use the Write tool to create `hello-world-1.txt` in the root directory
+- Content: "Hello from parallel work order 1!"
+- Verify the file is created at the correct location
+
+### Task 2: Validate file creation
+
+- Verify the file exists using `ls` or `cat` command
+- Confirm the content matches exactly: "Hello from parallel work order 1!"
+- Ensure file permissions are appropriate (readable)
+
+### Task 3: Run validation commands
+
+- Execute all validation commands listed below
+- Confirm the file is tracked by git (appears in `git status`)
+- Ensure no conflicts with existing files
+
+## Testing Strategy
+
+### Unit Tests
+
+No unit tests are required for this simple file creation task. The feature is validated through direct file system checks rather than automated tests.
+
+### Integration Tests
+
+No integration tests are needed as this file doesn't integrate with any application logic or systems.
+
+### Edge Cases
+
+- File already exists: If `hello-world-1.txt` already exists, it should be overwritten with the new content
+- Permission issues: Ensure the process has write permissions to the root directory
+- Content validation: Confirm exact string match including capitalization and punctuation
+
+## Acceptance Criteria
+
+- [ ] File `hello-world-1.txt` exists in the root directory
+- [ ] File contains exactly the text: "Hello from parallel work order 1!"
+- [ ] File is readable and has appropriate permissions
+- [ ] File appears in `git status` as an untracked file (if not committed)
+- [ ] No errors occur during file creation
+- [ ] File content can be verified with `cat hello-world-1.txt`
+
+## Validation Commands
+
+Execute every command to validate the feature works correctly with zero regressions.
+
+**File existence and content validation:**
+
+```bash
+# Verify file exists
+ls -la hello-world-1.txt
+
+# Display file content
+cat hello-world-1.txt
+
+# Verify exact content match
+test "$(cat hello-world-1.txt)" = "Hello from parallel work order 1!" && echo "Content matches!" || echo "Content mismatch!"
+
+# Check git status
+git status hello-world-1.txt
+```
+
+**Note:** Since this is a simple file creation task that doesn't involve Python source code, the standard linting, type checking, and pytest commands are not applicable. However, if this were implemented as a Python script, the following would apply:
+
+```bash
+# If implemented as a Python script:
+# uv run ruff check src/ (not applicable - no src code)
+# uv run mypy src/ (not applicable - no src code)
+# uv run pytest tests/ -v (not applicable - no test files needed)
+```
+
+## Notes
+
+- This feature is intentionally simple and serves as a test case for parallel work order execution
+- The file is created in the root directory rather than in `src/` or other subdirectories because it's a demonstration file, not application code
+- No Python code, tests, or documentation are required for this basic file operation
+- The implementation should take less than 1 minute to complete and validate
+- This task can be executed in parallel with other similar tasks (e.g., hello-world-2.txt, hello-world-3.txt) without conflicts
+- Following KISS principle: This is as simple as it gets - create one file with static content
+- Following YAGNI principle: No additional features, error handling, or configuration are needed beyond basic file creation

hello-world-1.txt

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+Hello from parallel work order 1!