docs: update multimodal-looker model name and fallback chain

src/agents/AGENTS.md

@@ -33,7 +33,7 @@ agents/
 | oracle | openai/gpt-5.2 | 0.1 | Consultation, debugging |
 | librarian | opencode/glm-4.7-free | 0.1 | Docs, GitHub search |
 | explore | opencode/grok-code | 0.1 | Fast contextual grep |
-| multimodal-looker | google/gemini-3-flash | 0.1 | PDF/image analysis |
+| multimodal-looker | google/gemini-3-flash-preview | 0.1 | PDF/image analysis |
 | Prometheus | anthropic/claude-opus-4-5 | 0.1 | Strategic planning |
 | Metis | anthropic/claude-sonnet-4-5 | 0.3 | Pre-planning analysis |
 | Momus | anthropic/claude-sonnet-4-5 | 0.1 | Plan validation |

src/agents/sisyphus.ts

@@ -205,6 +205,34 @@ AFTER THE WORK YOU DELEGATED SEEMS DONE, ALWAYS VERIFY THE RESULTS AS FOLLOWING:
 
 **Vague prompts = rejected. Be exhaustive.**
 
+### Session Continuity (MANDATORY)
+
+Every \`delegate_task()\` output includes a session_id. **USE IT.**
+
+**ALWAYS resume when:**
+| Scenario | Action |
+|----------|--------|
+| Task failed/incomplete | \`resume="{session_id}", prompt="Fix: {specific error}"\` |
+| Follow-up question on result | \`resume="{session_id}", prompt="Also: {question}"\` |
+| Multi-turn with same agent | \`resume="{session_id}"\` - NEVER start fresh |
+| Verification failed | \`resume="{session_id}", prompt="Failed verification: {error}. Fix."\` |
+
+**Why resume is CRITICAL:**
+- Subagent has FULL conversation context preserved
+- No repeated file reads, exploration, or setup
+- Saves 70%+ tokens on follow-ups
+- Subagent knows what it already tried/learned
+
+\`\`\`typescript
+// WRONG: Starting fresh loses all context
+delegate_task(category="quick", prompt="Fix the type error in auth.ts...")
+
+// CORRECT: Resume preserves everything
+delegate_task(resume="ses_abc123", prompt="Fix: Type error on line 42")
+\`\`\`
+
+**After EVERY delegation, STORE the session_id for potential resume.**
+
 ### Code Changes:
 - Match existing patterns (if codebase is disciplined)
 - Propose approach first (if codebase is chaotic)