fix: remove stop sequence that truncated indexer LLM output

The stop_sequences contained "```" which caused the model to stop
immediately after outputting "```yaml", truncating the entire response.
Also wrap blocking indexer operations in spawn_blocking to avoid
runtime conflicts with reqwest::blocking::Client.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.blue/docs/spikes/2026-01-25-Inconsistent Worktree Creation in Claude MCP.md

@@ -0,0 +1,17 @@
+# Spike: Inconsistent Worktree Creation in Claude MCP
+
+| | |
+|---|---|
+| **Status** | In Progress |
+| **Date** | 2026-01-25 |
+| **Time Box** | 2 hours |
+
+---
+
+## Question
+
+Why are worktrees and feature branches not being consistently created when using Blue MCP in Claude? What triggers (or fails to trigger) worktree creation?
+
+---
+
+*Investigation notes by Blue*

apps/blue-cli/src/main.rs

@@ -1529,6 +1529,15 @@ async fn detect_ollama_model() -> Option<String> {
 // ==================== Semantic Index Commands (RFC 0010) ====================
 
 async fn handle_index_command(command: IndexCommands) -> Result<()> {
+    // Run the blocking indexer operations in a separate thread
+    // to avoid runtime conflicts with reqwest::blocking::Client
+    tokio::task::spawn_blocking(move || {
+        handle_index_command_blocking(command)
+    }).await??;
+    Ok(())
+}
+
+fn handle_index_command_blocking(command: IndexCommands) -> Result<()> {
     use blue_core::store::DocumentStore;
     use blue_core::{Indexer, IndexerConfig, is_indexable_file, LocalLlmConfig};
     use blue_ollama::OllamaLlm;

crates/blue-core/src/indexer.rs

@@ -106,7 +106,7 @@ impl<P: LlmProvider> Indexer<P> {
         let options = CompletionOptions {
             max_tokens: self.config.max_tokens,
             temperature: self.config.temperature,
-            stop_sequences: vec!["```".to_string()], // Stop at end of YAML block
+            stop_sequences: vec![], // Let model complete naturally
         };
 
         let completion = self.provider.complete(&prompt, &options)