feat: Story 8 - Collapsible tool outputs + autonomous coding improvements

Implemented Story 8: Collapsible Tool Outputs
- Tool outputs now render in <details>/<summary> elements, collapsed by default
- Summary shows tool name with key argument (e.g., ▶ read_file(src/main.rs))
- Added arrow rotation animation and scrollable content (max 300px)
- Enhanced tool_calls display to show arguments inline
- Added CSS styling for dark theme consistency

Fixed: LLM autonomous coding behavior
- Strengthened system prompt with explicit examples and directives
- Implemented triple-reinforcement system (primary prompt + reminder + message prefixes)
- Improved tool descriptions to be more explicit and action-oriented
- Increased MAX_TURNS from 10 to 30 for complex agentic workflows
- Added debug logging for Ollama requests/responses
- Result: GPT-OSS (gpt-oss:20b) now successfully uses write_file autonomously

Documentation improvements
- Created MODEL_SELECTION.md guide with recommendations
- Updated PERSONA.md spec to emphasize autonomous agent behavior
- Updated UI_UX.md spec with collapsible tool output requirements
- Updated SDSW workflow: LLM archives stories and performs squash merge

Cleanup
- Removed unused ToolTester.tsx component

src-tauri/src/llm/ollama.rs

@@ -161,6 +161,11 @@ impl ModelProvider for OllamaProvider {
             tools,
         };
 
+        // Debug: Log the request body
+        if let Ok(json_str) = serde_json::to_string_pretty(&request_body) {
+            eprintln!("=== Ollama Request ===\n{}\n===================", json_str);
+        }
+
         let res = client
             .post(&url)
             .json(&request_body)
@@ -171,6 +176,10 @@ impl ModelProvider for OllamaProvider {
         if !res.status().is_success() {
             let status = res.status();
             let text = res.text().await.unwrap_or_default();
+            eprintln!(
+                "=== Ollama Error Response ===\n{}\n========================",
+                text
+            );
             return Err(format!("Ollama API error {}: {}", status, text));
         }