Add coverage prettification and sorting functionality

- Introduced `prettify.css` for syntax highlighting in coverage reports.
- Added `prettify.js` to handle code formatting and highlighting.
- Included `sort-arrow-sprite.png` for sort indicators in the coverage table.
- Implemented `sorter.js` to enable sorting and filtering of coverage summary tables.
- Added a search box for filtering table rows based on user input.

.codex/skills/issue-discover/phases/03-discover-by-prompt.md

@@ -389,19 +389,17 @@ await updateDiscoveryState(outputDir, {
 });
 
 // Prompt user for next action
-await AskUserQuestion({
-  questions: [{
-    question: `Discovery complete: ${issues.length} issues from ${cumulativeFindings.length} findings across ${iteration} iterations. What next?`,
-    header: "Next Step",
-    multiSelect: false,
-    options: [
-      { label: "Export to Issues (Recommended)", description: `Export ${issues.length} issues for planning` },
-      { label: "Review Details", description: "View comparison analysis and iteration details" },
-      { label: "Run Deeper", description: "Continue with more iterations" },
-      { label: "Skip", description: "Complete without exporting" }
-    ]
-  }]
-});
+await ASK_USER([{
+  id: "next_step",
+  type: "select",
+  prompt: `Discovery complete: ${issues.length} issues from ${cumulativeFindings.length} findings across ${iteration} iterations. What next?`,
+  options: [
+    { label: "Export to Issues (Recommended)", description: `Export ${issues.length} issues for planning` },
+    { label: "Review Details", description: "View comparison analysis and iteration details" },
+    { label: "Run Deeper", description: "Continue with more iterations" },
+    { label: "Skip", description: "Complete without exporting" }
+  ]
+}]);  // BLOCKS (wait for user response)
 ```
 
 ## Dimension Agent Prompt Template