Add some missing files to archive

archive/v21/cf4_velocity_SGXSGY_quiver.png

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+../../figures/cf4_velocity_SGXSGY_quiver.png

archive/v21/readme_v21.md

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+# Spin-Tether Force Framework v21 - File Structure
+
+This document has been split into multiple files for easier editing and collaboration:
+
+## File Structure
+
+1. **main_header_v21.tex** - Contains:
+   - Document class and package declarations
+   - Title, author information
+   - Abstract
+   - Complete Introduction
+
+2. **theory_math_v21.tex** - Contains:
+   - Related Work section
+   - Spin-Tether Force Derivation
+   - The Scale-Dependent Tether section
+   - Why This Isn't Curve Fitting section
+
+3. **examples_v21.tex** - Contains all examples:
+   - Subatomic Scale: Quark Confinement
+   - Atomic Scale: Hydrogen Atom
+   - Planetary Scale: Systematic Solar System Analysis
+   - Local Stellar Systems: Open Clusters
+   - Dark Matter Dominated Scale: Draco Dwarf
+   - Black Hole Scale: S2 Orbiting Sgr A*
+
+4. **observations_discussion_v21.tex** - Contains:
+   - Observational Tests
+   - Testable Predictions
+   - Observational Strategy
+   - Falsification Criteria
+   - Relativistic Considerations
+   - Standard Model Force Carriers
+   - Physical Interpretations
+   - Galaxy Flows sections
+   - Stellar Dynamics at Galactic Center
+   - Cosmological Leash section
+   - Discussion
+   - Bibliography commands
+
+5. **main_document_v21.tex** - The main file that combines everything
+
+## How to Compile
+
+### Method 1: Using the Main Document (Recommended)
+```bash
+pdflatex main_document_v21
+bibtex main_document_v21
+pdflatex main_document_v21
+pdflatex main_document_v21
+```
+
+### Method 2: Manual Combination
+If you prefer a single file, copy and paste the contents in this order:
+1. Everything from main_header_v21.tex up to (but not including) `\end{document}`
+2. Contents of theory_math_v21.tex
+3. Contents of examples_v21.tex
+4. Contents of observations_discussion_v21.tex
+
+## Required Files for Compilation
+
+Make sure these files are in the same directory:
+- spin_force_refs.bib
+- cf4_velocity_SGXSGY_quiver.png
+- spin_tether_test_results.png

archive/v21/spin_tether_test_results.png

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+../../figures/spin_tether_test_results.png