docs: update STRUCTURE.md with full agent structure, pipeline, dispatch protocol
- Added complete agent role definitions (Prime, Ripley, Neo, Scarlett, Bishop, Private_Hudson)
- Added development pipeline: Neo → Bishop → Private_Hudson → Ripley
- Added agent dispatch protocol with context block template
- Added Docker setup documentation (ports, auth mode, test procedure)
- Added universal mandate and tech stack compliance checklist
- Updated FUTURE.md: marked Phase 1 CRITICAL as done (was already complete)
- Added Engineering Reference Manual as LOW priority with explicit user initiation note
- Updated DEVELOPMENT_LOG.md with completed work entries
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