feat(07-01): replace worked example with v1.1 directory archive
- New worked example: 3 entries (2 dirs + 1 file) totaling 427 bytes
- Demonstrates nested dir (project/src), file (project/src/main.rs), empty dir (project/empty)
- Entry hex tables show entry_type and permissions fields
- Directory entries have all-zero crypto fields (iv, hmac, sha256, sizes)
- File entry shows full crypto pipeline with real SHA-256 hash
- Archive layout table with verified offsets (header=40, TOC=355, data=32)
- Complete annotated hex dump covers all 427 bytes
- Shell decode walkthrough handles directory entries (mkdir -p + chmod)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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