docs: Consolidate documentation and fix protocol numbering (partial)

Phase 2 of restructuring plan:
- Rename SYS_16_STUDY_INSIGHTS -> SYS_17_STUDY_INSIGHTS
- Rename SYS_17_CONTEXT_ENGINEERING -> SYS_18_CONTEXT_ENGINEERING
- Promote Bootstrap V3.0 (Context Engineering) as default
- Archive old Bootstrap V2.0
- Create knowledge_base/playbook.json for ACE framework
- Add OP_08 (Generate Report) to routing tables
- Add SYS_16-18 to protocol tables
- Update docs/protocols/README.md to version 1.1
- Update CLAUDE.md with new protocols
- Create docs/plans/RESTRUCTURING_PLAN.md for continuation

Remaining: Phase 2.8 (Cheatsheet), Phases 3-6

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/api/CONTEXT_ENGINEERING_API.md

@@ -944,5 +944,5 @@ Error response format:
 ## See Also
 
 - [Context Engineering Report](../CONTEXT_ENGINEERING_REPORT.md) - Full implementation report
-- [SYS_17 Protocol](../protocols/system/SYS_17_CONTEXT_ENGINEERING.md) - System protocol
+- [SYS_18 Protocol](../protocols/system/SYS_18_CONTEXT_ENGINEERING.md) - System protocol
 - [Cheatsheet](../../.claude/skills/01_CHEATSHEET.md) - Quick reference