docs: use Diátaxis structure

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+# Work Directory
+
+**Purpose:** Temporary working documents during development sessions  
+**Lifecycle:** Created during session → Archived at session end  
+**Status:** `.gitignore`d - not committed to version control
+
+---
+
+## What Goes Here
+
+- Session summaries and notes
+- Status reports and visual summaries
+- Migration documentation (during migration)
+- Planning documents
+- Temporary analysis files
+
+**Rule:** Nothing in this directory should be permanent. Archive or delete at session end.
+
+---
+
+## Workflow
+
+### During Session
+```bash
+# Create working docs here
+echo "Session notes..." > work/session-notes.md
+echo "Status..." > work/status.md
+```
+
+### End of Session
+```bash
+# Archive important docs
+mv work/session-notes.md docs/archive/2025-11-04-session-notes.md
+
+# Delete obsolete docs
+rm work/status.md
+
+# Clean up
+rm -rf work/*
+```
+
+---
+
+## .gitignore
+
+This directory is ignored by git (except this README):
+
+```
+work/*
+!work/README.md
+```
+
+**Why:** Working documents are session-specific and shouldn't clutter the repository.
+
+---
+
+## Best Practices
+
+**DO:**
+- ✅ Use for temporary session work
+- ✅ Use descriptive names
+- ✅ Archive valuable content before deleting
+- ✅ Clean up at session end
+
+**DON'T:**
+- ❌ Put permanent documentation here
+- ❌ Reference work/ docs from permanent docs
+- ❌ Commit work/ contents to git
+- ❌ Let it accumulate files
+
+---
+
+## Alternative: Session-Specific Directories
+
+For complex sessions, create dated subdirectories:
+
+```bash
+work/
+├── 2025-11-04-diataxis-migration/
+│   ├── notes.md
+│   ├── checklist.md
+│   └── visual-summary.txt
+└── 2025-11-05-feature-x/
+    └── plan.md
+```
+
+Archive the entire directory when done:
+```bash
+tar czf docs/archive/2025-11-04-diataxis-migration.tar.gz work/2025-11-04-diataxis-migration/
+rm -rf work/2025-11-04-diataxis-migration/
+```
+
+---
+
+*This README is the only file in work/ committed to git.*