refactor: Rename "session" to "workflow" for documented processes

This resolves the ambiguity where "session" meant two different things:
- Working session (time period we work together)
- Documented routine/workflow (process to achieve a goal)

Changes:
- Renamed docs/sessions/ → docs/workflows/
- Renamed create-session.org → create-workflow.org
- Updated all references throughout:
  - "session type" → "workflow"
  - "session workflow" → "workflow"
  - "session definition" → "workflow definition"
  - "Available Session Types" → "Available Workflows"

Updated files:
- docs/NOTES.org - All workflow references updated
- docs/workflows/*.org - All workflow files updated with new terminology
- ~/documents/claude/NOTES.org - Template updated
- ~/documents/claude/NOTES-NEW.org - New template updated

Terminology now clear:
- "Let's run the refactor workflow" = Execute existing workflow
- "I want to create a refactor workflow" = Create new workflow definition
- "This session" = Working time period (unchanged)

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

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

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