feat: update duplicate-code-detector to focus only on Go files and exclude JavaScript

[Copilot]

Summary

Updated the duplicate-code-detector workflow to analyze only Go source files and explicitly exclude all JavaScript files (including .cjs) from duplicate code analysis.

Changes

1. JavaScript File Exclusion

Added explicit exclusion of all JavaScript file types to prevent analysis of JavaScript files:

• .js, .cjs, .mjs - JavaScript files
• .jsx, .tsx - React/TypeScript JSX files
• .ts - TypeScript files

These exclusions are now documented in two critical sections:

• Changed Files Analysis section - to prevent initial file selection
• Skip These Patterns section - to clarify what should not be analyzed

2. Go-Only Analysis Focus

Added explicit restriction to analyze ONLY .go files:

• New instruction in "Changed Files Analysis": "ONLY analyze .go files - exclude all other file types"
• New "File Type Restriction" in "Analysis Depth" section
• Updated all analysis descriptions to reference .go files specifically
• Changed focus from "all files" to "all .go files" in Primary and Secondary Analysis sections

3. Issue Assignment

Verified that created issues are properly assigned to @copilot for automated remediation:

• Issue template includes **Assignee**: @copilot
• Operational guidelines confirm assignment for automated remediation

Rationale

The duplicate-code-detector workflow uses Serena's semantic code analysis, which is most effective when focused on a single language ecosystem. By restricting analysis to Go files only:

1. Reduces false positives - JavaScript and Go have different idioms and patterns
2. Improves analysis quality - Serena can focus on Go-specific duplication patterns
3. Reduces execution time - Fewer files to analyze means faster workflow completion
4. Better resource utilization - Avoids analyzing files that aren't relevant to the Go codebase

Testing

• ✅ Workflow compiles successfully with 0 errors and 0 warnings (improved from 2 warnings)
• ✅ All unit tests pass
• ✅ Changes reflected in both .md source and compiled .lock.yml workflow
• ✅ Code formatted according to project standards

Related Issue

Addresses requirements to:

• Ignore all JavaScript files (.cjs and related extensions)
• Focus analysis only on .go files
• Ensure issues are assigned to @copilot

Original prompt

• Update duplicate finder to IGNORE all JavaScript files .cjs. Only focus on .go files
• assign the created issue to copilot

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