chore: archive completed and abandoned plans to reduce context debt

- Compress plans/completed/ (976KB) to tar.gz archive (190KB)
- Compress plans/abandoned/ (312KB) to tar.gz archive (72KB)
- Remove original directories to reduce AI context footprint by 31%
- Add Context Management Rules to CLAUDE.md for AI exclusion guidance
- Net reduction: ~1.3MB active markdown → ~262KB compressed archives

Size reduction: 3.2MB → 2.2MB (1.0MB savings)
Context savings: Frees ~130,000-150,000 tokens (~65-75% of session budget)
from active search space while preserving complete history in archives.

Archives can be extracted with:
  tar -xzf plans/completed-plans-archive-2025.tar.gz
  tar -xzf plans/abandoned-plans-archive-2025.tar.gz

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

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

Author: blalterman

CLAUDE.md

@@ -10,6 +10,21 @@ This file provides essential guidance to Claude Code when working with the Solar
 5. **Startup Briefing**: Provide project overview including agents, workflows, current state
 6. **Prompt Improvement**: For moderate/complex tasks, proactively suggest prompt improvements before execution
 
+## Context Management Rules
+1. **Archive Exclusion**: NEVER search, read, or glob the following compressed archives:
+   - `plans/completed-plans-archive-2025.tar.gz` - Contains historical completed plans (190KB compressed from 976KB)
+   - `plans/abandoned-plans-archive-2025.tar.gz` - Contains historical abandoned plans (72KB compressed from 312KB)
+2. **Active Plans Only**: Focus all searches on:
+   - Root-level plan files in `plans/` directory (`*.md` files)
+   - Active plan subdirectories (not archived)
+   - Template and guide files for reference
+3. **Rationale**: These archives contain 40% of the plans/ directory's original disk usage (1.3MB) but provide minimal active value. They are compressed binary files that cannot be read directly. Compacted state summaries in active plans provide sufficient historical context when needed.
+4. **Archive Access**: To access archived plans if absolutely necessary:
+   ```bash
+   tar -xzf plans/completed-plans-archive-2025.tar.gz
+   tar -xzf plans/abandoned-plans-archive-2025.tar.gz
+   ```
+
 ## Prompt Improvement Protocol
 
 ### When to Analyze Prompts