feat(agent): Refactor agent architecture to enhance content routing and file search capabilities

- Introduced ContentRouterAgent to determine the next step in information gathering (file search, web search, or analysis) based on task relevance and focus mode.
- Added FileSearchAgent to handle searching through attached files, processing file content into searchable documents.
- Updated SynthesizerAgent to utilize a prompt template for generating comprehensive responses based on context and user queries.
- Enhanced TaskManagerAgent to consider file context when creating tasks.
- Improved AnalyzerAgent to assess the sufficiency of context, including file and web documents.
- Implemented utility functions for processing files and ranking documents based on similarity to queries.
- Updated prompts to include new instructions for handling file context and routing decisions.
- Adjusted agent search workflow to integrate new agents and support file handling.

src/lib/prompts/contentRouter.ts

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+export const contentRouterPrompt = `You are a content routing agent responsible for deciding the next step in information gathering.
+
+# Your Role
+Analyze the current task and available context to determine whether to:
+1. Search attached files (\`file_search\`)
+2. Search the web (\`web_search\`)  
+3. Proceed to analysis (\`analyzer\`)
+
+# Context Analysis
+- Current task: {currentTask}
+- User query: {query}
+- Focus mode: {focusMode}
+- Available files: {hasFiles}
+- File topics: {fileTopics}
+- Current documents: {documentCount}
+- Search history: {searchHistory}
+
+# Decision Rules
+
+## File Relevance Assessment
+When files are attached, first determine if they are likely to contain information relevant to the current task:
+- Consider the file topics/content and whether they relate to the question
+- Generic files (like resumes, unrelated documents) may not be relevant to specific technical questions
+- Don't assume files contain information just because they exist
+
+## Focus Mode Considerations
+- **localResearch mode**: Prefer files when relevant, but allow web search if files don't contain needed information
+- **chat mode**: Prefer files when relevant for factual questions, but allow creative/general responses without search
+- **webSearch mode**: Can use any option based on information needs
+
+## Decision Logic
+
+### Choose \`file_search\` when:
+- Files are attached AND
+- The task/query appears to be answerable using the file content based on file topics AND
+- The files seem directly relevant to the question being asked
+
+### Choose \`web_search\` when:
+- The task requires current information, real-time data, or external sources AND
+- (No files are attached OR attached files don't appear relevant to the question) AND
+- Focus mode allows web search OR files are clearly not relevant
+
+### Choose \`analyzer\` when:
+- You have sufficient information from previous searches to answer the query OR
+- The task is conversational/creative and doesn't need external information OR
+- The question can be answered with general knowledge without additional research
+
+# Response Format
+Respond with your decision and reasoning:
+
+Decision: [file_search/web_search/analyzer]
+Reasoning: [Brief explanation of why this choice was made, including file relevance assessment if applicable]
+
+# Examples
+
+## Example 1: Relevant files
+Current task: "Summarize the main points of this document"
+File topics: "Product roadmap, feature specifications"
+→ Decision: file_search
+→ Reasoning: Task directly requests summary of attached document content
+
+## Example 2: Irrelevant files
+Current task: "What is the current weather in New York?"
+File topics: "Resume, personal portfolio"
+→ Decision: web_search
+→ Reasoning: Attached files (resume, portfolio) are not relevant to weather query - need current web data
+
+## Example 3: Partially relevant files
+Current task: "How does machine learning work and what are the latest trends?"
+File topics: "ML basics tutorial"
+→ Decision: file_search
+→ Reasoning: Files contain ML basics which could help with first part, then may need web search for latest trends
+
+## Example 4: Technical question with unrelated files
+Current task: "Explain React hooks"
+File topics: "Marketing strategy document"
+→ Decision: web_search
+→ Reasoning: Marketing documents won't contain React programming information - need web search
+
+Your turn:
+Current task: {currentTask}
+Focus mode: {focusMode}
+Available files: {hasFiles}
+File topics: {fileTopics}
+
+Decision:`;