(feat) Added Nexus Plugin

.nexus/LOGS/AI_DECISION_LOG.md

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+# AI DECISION LOG – Structum Monorepo
+
+> **Purpose**: Record all technical decisions of medium/high impact made with AI assistance.
+>
+> **Status**: ACTIVE | **Last Updated**: 2025-12-15
+>
+> **Usage**: Every significant decision MUST be logged here. Use `/LOG_DECISION` command from Engineering Playbook.
+
+---
+
+## Decision Entry Format
+
+Each decision must have:
+- **ID**: Unique sequential ID (DEC-XXXX)
+- **Date**: Date decision was made (YYYY-MM-DD)
+- **Type**: Category of decision (see legend below)
+- **Title**: Short summary (60 chars max)
+- **Owner**: Who made/approved decision
+- **Rationale**: Brief explanation (140 chars max, detailed in ADR if complex)
+- **Impact**: Primary affected area/module
+- **Risk Level**: LOW / MEDIUM / HIGH / CRITICAL
+- **Migration Status**: N/A / PLANNED / IN_PROGRESS / COMPLETE (for breaking changes)
+- **Status**: PROPOSED / APPROVED / IMPLEMENTED / SUPERSEDED
+- **ADR**: Link to ADR file if exists
+- **PR/Commit**: Link to implementation
+
+---
+
+## Decision Type Legend
+
+- **ARCH**: Architectural decision (affects system structure)
+- **REFACTOR**: Structural refactoring decision
+- **PROCESS**: Development process or workflow decision
+- **FEATURE**: New feature design decision
+- **SECURITY**: Security-related decision
+- **PERFORMANCE**: Performance optimization decision
+- **DEPENDENCY**: Dependency addition/removal/upgrade
+- **TOOLING**: Development tooling decision
+- **OTHER**: Uncategorized decision
+
+---
+
+## Active Decisions
+
+| ID | Date | Type | Title | Owner | Rationale | Impact | Risk Level | Migration | Status | ADR | PR/Commit |
+|----|------|------|-------|-------|-----------|--------|------------|-----------|--------|-----|-----------|
+| DEC-0001 | 2025-12-15 | ARCH | Standard logging for core modules | PythonWoods | Uniform observability, deprecate print() | structum/src/ | LOW | N/A | APPROVED | N/A | Pending |
+| DEC-0002 | 2025-12-16 | REFACTOR | Centralized configuration management | PythonWoods | Avoid duplication, ensure thread-safety | structum/config/ | MEDIUM | N/A | APPROVED | N/A | Pending |
+| DEC-0003 | 2025-12-15 | PROCESS | Adopt Gemini Governance System v2.0 | PythonWoods | Scalable AI workflow, institutional memory | All .nexus/ | LOW | N/A | IMPLEMENTED | [ADR-0001](../ADR/ADR-0001-gemini-governance-system.md) | [9c36ddf](https://github.com/pythinwoods/structum/commit/9c36ddf) |
+| DEC-0004 | 2025-12-15 | PROCESS | Transform .nexus/ to Autonomous Agentic Framework | Claude Code + PythonWoods | Solve "Paradosso del Custode Senza Memoria", enable fully autonomous AI operation | All .nexus/ | LOW | N/A | IMPLEMENTED | [ADR-0002](../ADR/ADR-0002-agentic-framework-transformation.md) | cb0930e |
+| DEC-0005 | 2025-12-15 | FEATURE | Create Official Structum Gemini Plugin | Claude Code + PythonWoods | Make Nexus AI Agentic Framework v3.0 accessible via Structum CLI, enable easy installation | nexus-ai/ | LOW | N/A | SUPERSEDED | N/A | 75eaa8b |
+| DEC-0006 | 2025-12-15 | PROCESS | Enhance Gemini v3.1 with Claude Code Best Practices | Claude Code + PythonWoods | Extract operational excellence patterns from Claude Code (tool orchestration, error recovery, git workflows) | All .nexus/ | LOW | N/A | IMPLEMENTED | N/A | 780e9da |
+| DEC-0007 | 2025-12-16 | ARCH | Refactor to Standalone Nexus AI Package | Claude Code + PythonWoods | Remove Structum dependency, make framework truly independent and language-agnostic. Supersedes DEC-0005 plugin approach | nexus-ai/ | MEDIUM | N/A | IMPLEMENTED | N/A | 66d9db1, 74c03b3 |
+
+---
+
+## Instructions for Adding Decisions
+
+### For AI (via `/LOG_DECISION` command)
+
+**When to Log**:
+- Architecture changes (new patterns, layers, boundaries)
+- New dependencies added or major upgrades
+- Security-related choices
+- Breaking changes to public APIs
+- Process/workflow changes
+- Performance trade-offs
+
+**How to Log**:
+1. Determine next sequential ID (check table above)
+2. Fill all columns in table row format
+3. Add row to "Active Decisions" table above
+4. Update Charter Section 4 "Decision Log Summary" with brief entry
+5. If architectural/process, propose ADR via `/PROPOSE_ADR`
+6. Reference DEC-XXXX in all related commits
+
+**Template Row**:
+```
+| DEC-XXXX | YYYY-MM-DD | TYPE | Short title | Owner | Brief rationale | Impact area | RISK | Migration | STATUS | ADR link | PR/Commit link |
+```
+
+### For Human Orchestrator
+
+Use same process as AI, but may skip ADR for minor decisions.
+
+---
+
+## Superseded Decisions (Archive)
+
+Decisions that have been replaced or are no longer relevant:
+
+| ID | Date | Type | Title | Superseded By | Reason for Change |
+|----|------|------|-------|---------------|-------------------|
+| (None yet) | | | | | |
+
+**Note**: When a decision is superseded, move it from "Active Decisions" to this table and link the new decision.
+
+---
+
+## Decision Statistics (Optional)
+
+**Total Decisions**: 7
+**By Type**:
+- ARCH: 2
+- REFACTOR: 1
+- PROCESS: 3
+- FEATURE: 1
+
+**By Status**:
+- APPROVED: 2
+- IMPLEMENTED: 4
+- SUPERSEDED: 1
+
+**By Risk Level**:
+- LOW: 4
+- MEDIUM: 2
+
+**Update Frequency**: Update these stats monthly or when convenient.
+
+---
+
+## Integration with Other Documents
+
+**Governance Framework**: Defines WHAT decisions must be logged
+**Engineering Playbook**: Defines HOW to log decisions (commands, workflow)
+**Project Charter**: Summarizes recent decisions in Section 4
+**ADRs**: Detailed rationale for architectural/process decisions
+**Session Log**: Links decisions to specific work sessions
+
+---
+
+## Quick Reference for AI
+
+**Before Making Significant Decision**:
+- [ ] Check if similar decision exists in log
+- [ ] Consider if ADR is needed (architecture/process changes)
+- [ ] Prepare rationale and impact assessment
+
+**After Making Decision**:
+- [ ] Add row to Active Decisions table
+- [ ] Update Charter Section 4 summary
+- [ ] Create ADR if applicable (`/PROPOSE_ADR`)
+- [ ] Reference DEC-XXXX in commits
+
+**At Session End**:
+- [ ] Verify all significant decisions logged
+- [ ] Ensure DEC-IDs referenced in Session Log
+- [ ] Propose any missing ADRs
+
+---
+
+**END OF AI DECISION LOG**
+
+**Last Entry**: DEC-0007 (2025-12-16)
+**Next Available ID**: DEC-0008