feat: Migrate to Skill-Based Search and enhance context handling

- Implemented a new skill-based search approach, replacing MCP search tools to reduce session start context from ~2,500 tokens to ~250 tokens.
- Added 10 new HTTP API endpoints to the worker service for various search functionalities.
- Created a new search skill with detailed instructions and examples for users.
- Removed MCP search server references and updated documentation to reflect the new skill-based approach.
- Enhanced context handling in the context hook to conditionally display the most recent summary based on observations.
- Introduced comprehensive documentation for Agent Skills, including creation, management, and best practices.

src/hooks/context-hook.ts

@@ -441,8 +441,15 @@ async function contextHook(input?: SessionStartInput, useColors: boolean = false
     }
 
     // Add full summary details for most recent session
+    // Only show if summary was generated AFTER the last observation
     const mostRecentSummary = recentSummaries[0];
-    if (mostRecentSummary && (mostRecentSummary.investigated || mostRecentSummary.learned || mostRecentSummary.completed || mostRecentSummary.next_steps)) {
+    const mostRecentObservation = observations[0]; // observations are DESC by created_at_epoch
+
+    const shouldShowSummary = mostRecentSummary &&
+      (mostRecentSummary.investigated || mostRecentSummary.learned || mostRecentSummary.completed || mostRecentSummary.next_steps) &&
+      (!mostRecentObservation || mostRecentSummary.created_at_epoch > mostRecentObservation.created_at_epoch);
+
+    if (shouldShowSummary) {
       output.push(...renderSummaryField('Investigated', mostRecentSummary.investigated, colors.blue, useColors));
       output.push(...renderSummaryField('Learned', mostRecentSummary.learned, colors.yellow, useColors));
       output.push(...renderSummaryField('Completed', mostRecentSummary.completed, colors.green, useColors));