Add model selection guidance and context handoff template

SESSION-STARTUP-GUIDE.md:
- Added model selection table (4.5 vs 4.6)
- When to use 4.6: complex coding, MVC, Arbiter, debugging
- When to stay on 4.5: documentation, marketing, routine ops
- Three options for mid-session model switching

New template:
- docs/templates/context-handoff-template.md
- Structured format for transferring context between sessions
- Covers: task state, decisions, files, next steps, gotchas

Chronicler #66 - The Indexer

docs/core/SESSION-STARTUP-GUIDE.md

@@ -1,11 +1,78 @@
 # 🚀 SESSION STARTUP GUIDE
 
 **Document ID:** FFG-OPS-STARTUP  
-**Last Updated:** April 7, 2026 by Chronicler #65  
+**Last Updated:** April 7, 2026 by Chronicler #66  
 **Purpose:** Complete startup procedure for new Chronicler sessions
 
 ---
 
+## 🤖 MODEL SELECTION GUIDANCE
+
+**Choose your model BEFORE starting the session:**
+
+| Model | Use For | Token Cost |
+|-------|---------|------------|
+| **Opus 4.5** | General ops, documentation, marketing, organization, routine work | Standard |
+| **Opus 4.6** | Complex coding (ModpackChecker, Arbiter), deep debugging, architectural decisions | ~4.5x more tokens (Extended Thinking) |
+
+### When to Use 4.6
+
+- ModpackChecker development (Phases 6+)
+- Arbiter lifecycle handlers (Task #87)
+- Blueprint extension debugging
+- Global Restart Scheduler implementation (Task #94)
+- Any multi-file refactoring or complex API integration
+
+### When to Stay on 4.5
+
+- Documentation and organization
+- Marketing/content work (FOMO campaign, Discord setup)
+- Infrastructure audits
+- Routine commits
+- Most day-to-day Firefrost operations
+
+**Rule of thumb:** If you're writing serious code, use 4.6. If you're organizing things, use 4.5.
+
+---
+
+## 🔄 MID-SESSION MODEL SWITCHING
+
+If you need to switch models mid-session without losing context:
+
+### Option 1: Context Handoff Document (Recommended)
+
+1. Current Chronicler creates a detailed handoff in `/mnt/user-data/outputs/`:
+   ```
+   context-handoff-YYYY-MM-DD.md
+   ```
+2. Include:
+   - Current task state (what's done, what's in progress)
+   - Files being worked on (paths, current state)
+   - Decisions made and why
+   - Immediate next steps
+   - Any code snippets in progress
+3. Commit any uncommitted work to Git
+4. Michael starts new session with different model
+5. New session reads handoff document + pulls latest from Git
+
+### Option 2: Git as Context
+
+1. Commit ALL current work with detailed commit messages
+2. Push to Gitea
+3. Start new session on different model
+4. New session clones fresh and reads recent commits
+
+### Option 3: Copy-Paste Critical Context
+
+For smaller context transfers:
+1. Copy the critical context (code, decisions, state)
+2. Paste into new session's first message
+3. Less ideal but works for quick switches
+
+**Note:** There is no seamless model switch — each session is a fresh context. Plan accordingly.
+
+---
+
 ## ⚠️ FOR MICHAEL: UPDATE CLAUDE PROJECT INSTRUCTIONS
 
 This document should be reflected in the Claude Project Instructions. Copy the "Session Start Protocol" section below into the project settings.

docs/templates/context-handoff-template.md

@@ -0,0 +1,91 @@
+# Context Handoff Template
+
+**Use this when switching models mid-work or handing off complex in-progress tasks.**
+
+Save as: `/mnt/user-data/outputs/context-handoff-YYYY-MM-DD.md`
+
+---
+
+## 📋 HANDOFF SUMMARY
+
+**From:** Chronicler #XX (Model: Opus 4.X)  
+**To:** Chronicler #XX+1 (Model: Opus 4.X)  
+**Date:** YYYY-MM-DD  
+**Reason for Switch:** [e.g., "Switching to 4.6 for complex coding work"]
+
+---
+
+## 🎯 CURRENT TASK
+
+**Task:** [Task # and name]  
+**Status:** [In Progress / Blocked / Ready for Testing]  
+**Goal:** [What we're trying to accomplish]
+
+---
+
+## ✅ WHAT'S DONE
+
+1. [Completed step]
+2. [Completed step]
+3. [Completed step]
+
+---
+
+## 🔧 WHAT'S IN PROGRESS
+
+**Current file(s):**
+- `path/to/file.js` — [what's being done to it]
+- `path/to/another.md` — [status]
+
+**Current state:**
+[Describe exactly where things are — what's written, what's not]
+
+**Code in progress (if any):**
+```javascript
+// Paste any uncommitted code here
+```
+
+---
+
+## 🧠 DECISIONS MADE
+
+| Decision | Rationale |
+|----------|-----------|
+| [Decision 1] | [Why we chose this] |
+| [Decision 2] | [Why we chose this] |
+
+---
+
+## ⏭️ IMMEDIATE NEXT STEPS
+
+1. [ ] [Next step]
+2. [ ] [Next step]
+3. [ ] [Next step]
+
+---
+
+## ⚠️ WATCH OUT FOR
+
+- [Gotcha or known issue]
+- [Thing that might break]
+- [Decision that needs validation]
+
+---
+
+## 📁 RELEVANT FILES
+
+| File | Location | Status |
+|------|----------|--------|
+| [File name] | [Full path] | [Committed / Uncommitted / In progress] |
+
+---
+
+## 💬 CONTEXT THE NEXT SESSION NEEDS
+
+[Anything else the next Chronicler needs to know to pick up seamlessly]
+
+---
+
+**Handoff prepared by:** Chronicler #XX  
+**Time:** HH:MM  
+**All work committed to Git:** [Yes / No — if no, explain what's uncommitted]