Add SolarX SysML v2 SYSMOD model (Steps 1–6b)

Complete SYSMOD-structured SysML v2 model for SolarX PV system covering:
- Steps 1+2: Problem Statement & System Idea
- Step 3: Stakeholder Analysis (homeowner, gridOperator, installer, energyRegulator, maintenanceTechnician, government)
- Step 4: Requirements (REQ-F1–F6, REQ-NF1–NF4)
- Step 5: System Context & Actors with ports and interfaces
- Step 6: Use Cases (UC-1–UC-6) with objectives and requirement satisfaction
- Step 6b: Use Case Action Flows (UC-1 solar generation flow)

All step packages nested inside occurrence def SolarXProject per SYSMOD convention.
Includes CLAUDE.md with local modeling context and conventions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: TheNightFox-1

System Model/SolarX/LCA Analysis SolarX/Solar X System Model/CLAUDE.md

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+# SolarX System Model — CLAUDE.md
+
+## Purpose
+Full SYSMOD-based SysML v2 system model of SolarX. Built step by step in a conversational
+approach: brainstorm in natural language → confirm → generate SysML → validate → next step.
+
+## Working File
+`SolarXModel.sysml` — single growing file. All steps are appended to this file.
+Never overwrite prior content; always extend.
+
+## Step Sequence
+| Step | Name                        | Status     |
+|------|-----------------------------|------------|
+| 1    | Problem Statement           | pending    |
+| 2    | System Idea                 | pending    |
+| 3    | Stakeholder Analysis        | done       |
+| 4    | Requirements                | pending    |
+| 5    | System Context & Actors     | done       |
+| 6    | Use Cases                   | pending    |
+| 6b   | Use Case Action Flows       | pending    |
+| 7    | Functional Architecture     | pending    |
+| 8    | Logical Architecture        | pending    |
+| 9    | Physical Architecture       | pending    |
+
+## Step Order Note
+Requirements (Step 4) must come BEFORE System Context (Step 5).
+Stakeholders must be defined before requirements so that stakeholder links work.
+
+## Known SolarX Context
+- **System:** SolarX — a photovoltaic energy company
+- **AS-IS components:** PVArray, SolarInverter, BatteryStorage, SystemController, GridConnection
+- **Transformation goal:** from conventional PV company (SolarX) to sustainable PV company (SustainaSun)
+- **LCA integration:** PoC built in `../SimpleLCAIntegration/` using RDF/SPARQL semantic matching
+
+## Convention
+- One `.sysml` file, all steps accumulated
+- SYSMODLibrary package always at the bottom of the file
+- Brainstorm first, SysML only when user says "it's okay" or equivalent