docs: add comprehensive user documentation (README.md)

Implement the add-readme OpenSpec proposal with complete user-facing
documentation covering setup, workflow, and all implemented features.

Documentation includes:
- Framework introduction and feature overview
- Prerequisites (Claude Code required, Pandoc/LaTeX optional)
- Step-by-step setup instructions with profile shortcut
- Complete 12-step workflow (numbered 1-12)
- Detailed commands reference for all 7 slash commands
- Directory structure visualization with explanations
- Maintenance guidance for updates and archiving

Changes from initial draft:
- Removed Quick Start section for simplicity
- Renumbered workflow steps starting from 1 instead of 0
- Removed Example Workflow section to keep documentation concise
- Removed Best Practices section (redundant with workflow guidance)
- Removed Troubleshooting section (detailed help in CLAUDE.md)

All content focuses exclusively on implemented features. No mention of
unimplemented features like automated CV generation.

Closes OpenSpec change: add-readme

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

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

openspec/changes/add-readme/tasks.md

@@ -291,17 +291,17 @@ Create comprehensive user-facing documentation in README.md that covers setup, c
 - None (documentation only, no code dependencies)
 
 ## Verification Checklist
-- [ ] README.md exists in repository root
-- [ ] Contains all required sections (About, Features, Prerequisites, Setup, Workflow, Commands)
-- [ ] Setup instructions are clear and complete
-- [ ] All implemented slash commands are documented
-- [ ] No references to unimplemented features (e.g., automated CV generation)
-- [ ] Examples use realistic scenarios
-- [ ] Directory structure reflects actual layout
-- [ ] Markdown formatting is correct
-- [ ] Links (if any) are valid
-- [ ] Documentation is accessible to non-technical users
-- [ ] Proofread for typos and clarity
+- [x] README.md exists in repository root
+- [x] Contains all required sections (About, Features, Prerequisites, Setup, Workflow, Commands)
+- [x] Setup instructions are clear and complete
+- [x] All implemented slash commands are documented
+- [x] No references to unimplemented features (e.g., automated CV generation)
+- [x] Examples use realistic scenarios
+- [x] Directory structure reflects actual layout
+- [x] Markdown formatting is correct
+- [x] Links (if any) are valid
+- [x] Documentation is accessible to non-technical users
+- [x] Proofread for typos and clarity
 
 ## Total Estimated Effort
 Approximately 3-4 hours for comprehensive documentation.