fix(dustins_stack): remove gemini-3.5-flash-lite from targets and fallbacks

- Removed gemini-3.5-flash-lite from dustins_stack targets (7→6 models)
- Replaced Gemini fallbacks in multimodal_tier, ultra_long_context, fast_flow_tier
- Added dustins_stack seed data to db.go for fresh deploys
- Also commits pending Gemini role=function→user fix for ChatCompletion and ChatCompletionStream

internal/db/db.go

@@ -203,21 +203,72 @@ func (db *DB) RunMigrations() error {
 
 	// Seed default model groups
 	defaultGroups := []struct {
-		id, strategy, targets, selectorModel string
+		id, strategy, targets, selectorModel, heuristicRules string
 		complexityThreshold, logicLevel *int
 		primaryUse *string
 	}{
-		{"deepseek-auto", "heuristic", `["deepseek-chat","deepseek-reasoner"]`, "", nil, nil, nil},
-		{"openai-auto", "heuristic", `["gpt-4o-mini","gpt-4o"]`, "", nil, nil, nil},
-		{"gemini-auto", "heuristic", `["gemini-3.5-flash-lite","gemini-3.1-flash-lite","gemini-2.5-flash"]`, "", nil, nil, nil},
-		{"heavy-logic", "heuristic", `["grok-4.3","kimi-k2.6","deepseek-v4-pro"]`, "", nil, intPtr(9), strPtr("Complex Coding, Logic, Agents.")},
-		{"standard-pro", "heuristic", `["gpt-5.4-mini","gemini-3.5-flash-lite"]`, "", nil, intPtr(5), strPtr("General Assistant, Long Docs.")},
-		{"fast-flow", "heuristic", `["deepseek-v4-flash","gpt-5.4-nano"]`, "", nil, intPtr(2), strPtr("Classification, JSON, Basic Q&A.")},
-		{"dispatcher", "classifier", `["fast-flow","standard-pro","heavy-logic"]`, "gpt-5.4-nano", intPtr(10), nil, strPtr("Auto-dispatches to tier groups by complexity.")},
+		{"deepseek-auto", "heuristic", `["deepseek-chat","deepseek-reasoner"]`, "", "", nil, nil, nil},
+		{"openai-auto", "heuristic", `["gpt-4o-mini","gpt-4o"]`, "", "", nil, nil, nil},
+		{"gemini-auto", "heuristic", `["gemini-3.5-flash-lite","gemini-3.1-flash-lite","gemini-2.5-flash"]`, "", "", nil, nil, nil},
+		{"heavy-logic", "heuristic", `["grok-4.3","kimi-k2.6","deepseek-v4-pro"]`, "", "", nil, intPtr(9), strPtr("Complex Coding, Logic, Agents.")},
+		{"standard-pro", "heuristic", `["gpt-5.4-mini","gemini-3.5-flash-lite"]`, "", "", nil, intPtr(5), strPtr("General Assistant, Long Docs.")},
+		{"fast-flow", "heuristic", `["deepseek-v4-flash","gpt-5.4-nano"]`, "", "", nil, intPtr(2), strPtr("Classification, JSON, Basic Q&A.")},
+		{"dispatcher", "classifier", `["fast-flow","standard-pro","heavy-logic"]`, "gpt-5.4-nano", "", intPtr(10), nil, strPtr("Auto-dispatches to tier groups by complexity.")},
+		{"dustins_stack", "heuristic", `["mimo-v2.5","deepseek-v4-pro","grok-4.3","mimo-v2.5-pro","deepseek-v4-flash","kimi-2.6"]`, "", `[
+  {
+    "rule_id": "multimodal_tier",
+    "description": "Multimodal input routes to high-throughput multimodal models.",
+    "conditions": { "has_multimodal_input": true },
+    "primary_model": "mimo-v2.5",
+    "fallback_model": "mimo-v2.5-pro"
+  },
+  {
+    "rule_id": "ultra_long_context",
+    "description": "Massive context/document processing (>128k tokens) routes to long-context specialists.",
+    "conditions": { "min_input_tokens": 128000 },
+    "primary_model": "kimi-2.6",
+    "fallback_model": "deepseek-v4-pro"
+  },
+  {
+    "rule_id": "agentic_code_and_tools",
+    "description": "Tool-heavy agent loops (MCP, repo editing, SWE) to MiMo Pro.",
+    "conditions": { "requires_tool_calling": true, "any_of_tags": ["swe-bench", "tool-heavy"] },
+    "primary_model": "mimo-v2.5-pro",
+    "fallback_model": "deepseek-v4-pro"
+  },
+  {
+    "rule_id": "reasoning_heavy",
+    "description": "Deep reasoning, architecture, system design, and math.",
+    "conditions": { "requires_reasoning": true },
+    "primary_model": "deepseek-v4-pro",
+    "fallback_model": "grok-4.3"
+  },
+  {
+    "rule_id": "realtime_and_creative",
+    "description": "Real-time web search, open-ended synthesis, or high-creativity tasks.",
+    "conditions": { "any_of_tags": ["realtime-search", "creative", "synthesis"] },
+    "primary_model": "grok-4.3",
+    "fallback_model": "mimo-v2.5-pro"
+  },
+  {
+    "rule_id": "fast_flow_tier",
+    "description": "Short simple text, no reasoning, no tools.",
+    "conditions": { "max_input_tokens_lt": 16000, "requires_reasoning": false, "requires_tool_calling": false },
+    "primary_model": "deepseek-v4-flash",
+    "fallback_model": "mimo-v2.5"
+  },
+  {
+    "rule_id": "regional_fallback_general",
+    "description": "Catch-all default rule.",
+    "conditions": { "is_default_fallback": true },
+    "primary_model": "deepseek-v4-pro",
+    "fallback_model": "deepseek-v4-flash"
+  }
+]`, nil, nil, strPtr("Dustin's personal agent stack. No Gemini.")},
 	}
 	for _, g := range defaultGroups {
-		db.Exec(`INSERT OR IGNORE INTO model_groups (id, strategy, targets, selector_model, complexity_threshold, logic_level, primary_use) VALUES (?, ?, ?, ?, ?, ?, ?)`,
-			g.id, g.strategy, g.targets, nilStr(g.selectorModel), g.complexityThreshold, g.logicLevel, g.primaryUse)
+		db.Exec(`INSERT OR IGNORE INTO model_groups (id, strategy, targets, selector_model, heuristic_rules, complexity_threshold, logic_level, primary_use) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+			g.id, g.strategy, g.targets, nilStr(g.selectorModel), nilStr(g.heuristicRules), g.complexityThreshold, g.logicLevel, g.primaryUse)
 	}
 
 	return nil