docs: add prp for removing archon mentions from documentation

[Wirasm]

Summary

Remove all mentions of "archon" and "archin" from the project README and documentation files to maintain clean, focused project documentation. This is a documentation cleanup task to ensure no legacy or test content remains in production documentation.

Problem Statement

Historical commits show that test content mentioning "archon" was previously added to the README (commit fefd8fb: "hello from archon"). While this content appears to have been removed, we need to verify complete removal across all documentation files and ensure no similar mentions exist in other README files throughout the project.

Changes

• docs: add prp for removing archon mentions from documentation

Files Modified

• PRPs/features/completed/remove-archon-mentions.md

Implementation Details

See: PRPs/features/completed/remove-archon-mentions.md

This PRP provides a comprehensive plan for:

1. Searching all documentation files for case-insensitive matches
2. Verifying the main README.md is clean
3. Checking all subdirectory README files (14 files identified)
4. Documenting findings and confirming complete removal
5. Providing validation commands to ensure no mentions remain

Key Findings

• Main README.md currently contains no mentions of "archon" or "archin"
• Historical commits show test content was added but subsequently removed
• This task is primarily a verification and documentation cleanup task
• Scope includes documentation only (excludes git history and branch names)

Testing

• PRP file created with comprehensive validation commands
• Implementation plan with step-by-step tasks
• Acceptance criteria defined
• Execute validation commands to verify complete removal (pending)
• Manual verification of all 14 subdirectory README files (pending)

Validation Commands

The PRP includes comprehensive validation commands to verify complete removal:

# Search all README files with word boundaries
grep -i "\barchon\b\|\barchin\b" README.md */README.md */*/README.md

# Search all tracked files
git grep -i "\barchon\b\|\barchin\b" -- '*.md' '*.py' '*.txt'

# Verify main README specifically
grep -i "archon|archin" README.md