feat: add 4 agentic code quality workflows (#2417)

* Initial plan

* feat: add 4 agentic code quality workflows

- duplicate-code-detector.md: weekly scan for near-duplicate code blocks,
  files issues for high-impact deduplication opportunities
- test-coverage-reporter.md: weekly + on push to main, reports coverage
  trends as GitHub Discussions
- refactoring-scanner.md: weekly scan for oversized/mixed-responsibility
  files, files refactoring issues
- export-audit.md: on push to main, detects unused exports, naming
  inconsistencies, circular deps, wrong test imports

All compiled to .lock.yml via gh aw compile and post-processed.

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/28e98601-c6b6-425c-9141-a0d0c455ec04

* fix: capitalize/punctuation review feedback in workflow descriptions

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/28e98601-c6b6-425c-9141-a0d0c455ec04

* feat: change duplicate-code-detector, refactoring-scanner, test-coverage-reporter to daily schedule

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/6bcb659e-1e94-4f2d-9d14-4071b8c26f60

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

* fix: address code review feedback on all 4 workflow .md files

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/f49cc459-e3d0-4f79-8c1e-f157a23d6a9b

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

Author: Copilot

.github/workflows/duplicate-code-detector.lock.yml

@@ -0,0 +1,223 @@
+---
+description: |
+  Daily workflow that scans the codebase for duplicate and near-duplicate code blocks,
+  copy-paste patterns, and repeated logic sequences in TypeScript source and JavaScript
+  container code. Files actionable issues for high-impact deduplication opportunities
+  to prevent technical debt from accumulating silently.
+
+on:
+  schedule: daily
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  issues: read
+
+sandbox:
+  agent:
+    version: v0.25.29
+network:
+  allowed:
+    - node
+    - github
+
+tools:
+  github:
+    toolsets: [issues]
+  bash: true
+
+safe-outputs:
+  threat-detection:
+    enabled: false
+  create-issue:
+    title-prefix: "[Duplicate Code] "
+    labels: [code-quality, refactoring]
+    max: 5
+    expires: 30d
+
+timeout-minutes: 20
+---
+
+# Duplicate Code Detector
+
+You are a code quality engineer analyzing the `${{ github.repository }}` codebase for duplicated and near-duplicate code. Your mission is to surface high-impact deduplication opportunities that will reduce maintenance burden and improve consistency.
+
+## Repository Context
+
+This is **gh-aw-firewall**, a network firewall for GitHub Copilot CLI. The most important source files for duplication analysis are:
+
+- `src/docker-manager.ts` — 3,900+ lines; container lifecycle, env-var construction, volume mounts
+- `src/cli.ts` — 1,700+ lines; argument parsing, orchestration, config merging
+- `containers/api-proxy/server.js` — provider-agnostic proxy server
+- `containers/api-proxy/providers/*.js` — per-provider adapter modules
+
+## Phase 1: Gather Codebase Metrics
+
+Run these commands to understand the scope before diving into duplication:
+
+```bash
+# File sizes and line counts
+wc -l src/*.ts src/**/*.ts containers/api-proxy/*.js containers/api-proxy/providers/*.js 2>/dev/null | sort -rn | head -30
+
+# Total files and lines
+echo "=== TypeScript source ==="
+find src -name "*.ts" ! -name "*.test.ts" | xargs wc -l 2>/dev/null | sort -rn | head -20
+echo "=== Container JS ==="
+find containers -name "*.js" | xargs wc -l 2>/dev/null | sort -rn | head -20
+```
+
+## Phase 2: Detect Structural Duplication
+
+Install and run the `jscpd` (JavaScript Copy/Paste Detector) tool to find literal code duplication:
+
+```bash
+# Install jscpd
+npm install -g jscpd 2>&1 | tail -3
+
+# Run duplicate detection on TypeScript source
+jscpd src --min-lines 10 --min-tokens 50 --reporters json --output /tmp/jscpd-src 2>&1 | tail -20
+
+# Run on container JS
+jscpd containers --min-lines 10 --min-tokens 50 --reporters json --output /tmp/jscpd-containers 2>&1 | tail -20
+
+# Show summary
+cat /tmp/jscpd-src/jscpd-report.json 2>/dev/null | node -e "
+  const d = JSON.parse(require('fs').readFileSync('/dev/stdin', 'utf8'));
+  const clones = d.duplicates || [];
+  console.log('Total duplicates found:', clones.length);
+  clones.slice(0, 10).forEach(c => {
+    const f1 = c.firstFile?.name?.replace(process.cwd() + '/', '') || 'unknown';
+    const f2 = c.secondFile?.name?.replace(process.cwd() + '/', '') || 'unknown';
+    console.log(\`  \${f1}:\${c.firstFile?.start}-\${c.firstFile?.end} <-> \${f2}:\${c.secondFile?.start}-\${c.secondFile?.end} (\${c.fragment?.split('\\n').length || 0} lines)\`);
+  });
+" || echo "(jscpd report not available)"
+```
+
+## Phase 3: Detect Pattern-Level Duplication
+
+Use grep to find repeated code patterns that jscpd may not catch (semantic duplication):
+
+```bash
+echo "=== Env-var reading/trimming patterns ==="
+grep -rn "process\.env\." src/ --include="*.ts" | grep -v "test" | head -40
+
+echo "=== Docker exec/run command construction patterns ==="
+grep -n "execa\|execaSync\|docker.*run\|docker.*exec" src/docker-manager.ts | head -30
+
+echo "=== Config/validation patterns in config-file.ts and schema-validator.ts ==="
+grep -n "throw\|error\|invalid\|validate" src/config-file.ts | head -20
+grep -n "throw\|error\|invalid\|validate" src/schema-validator.ts 2>/dev/null | head -20
+
+echo "=== Repeated try/catch error handling patterns ==="
+grep -n -A 3 "catch (e" src/docker-manager.ts | head -60
+
+echo "=== Provider adapter patterns in api-proxy ==="
+for f in containers/api-proxy/providers/*.js; do
+  echo "--- $f ---"
+  grep -n "function\|const.*=.*(" "$f" | head -10
+done
+
+echo "=== Repeated log construction patterns ==="
+grep -rn "logger\.\(debug\|info\|warn\|error\)" src/ --include="*.ts" | \
+  sed 's/.*logger\.\(debug\|info\|warn\|error\)(\(.*\))/\2/' | \
+  sort | uniq -d | head -20
+```
+
+## Phase 4: Analyze Specific Known Duplication Areas
+
+Based on codebase knowledge, deeply analyze the most likely duplication hotspots:
+
+```bash
+echo "=== docker-manager.ts: env-var construction ==="
+grep -n "env\[.*\]\s*=\|envVars\.\|\.trim()\|process\.env\." src/docker-manager.ts | head -50
+
+echo "=== docker-manager.ts: repeated docker compose args patterns ==="
+grep -n "composeArgs\|dockerArgs\|\-f.*compose\|--project-name" src/docker-manager.ts | head -30
+
+echo "=== cli.ts: option handling patterns ==="
+grep -n "\.option\|options\.\|program\." src/cli.ts | head -50
+
+echo "=== API proxy provider similarity (getConfig patterns) ==="
+for f in containers/api-proxy/providers/openai.js containers/api-proxy/providers/anthropic.js containers/api-proxy/providers/gemini.js containers/api-proxy/providers/copilot.js containers/api-proxy/providers/opencode.js; do
+  if [ -f "$f" ]; then
+    echo "--- $f: exported functions ---"
+    grep -n "^function\|^const.*=\s*function\|^module\.exports\|^exports\." "$f" | head -10
+  fi
+done
+
+echo "=== proxy-utils.js: shared utilities ==="
+cat containers/api-proxy/proxy-utils.js 2>/dev/null | head -60
+```
+
+## Phase 5: Check for Existing Issues
+
+Before filing new issues, check what's already been reported:
+
+1. Search for open issues with `[Duplicate Code]` prefix using the GitHub toolset
+2. Also search for issues with labels `code-quality` or `refactoring` that describe duplication
+3. Skip any finding that already has an open tracking issue
+
+## Phase 6: Prioritize and Report Findings
+
+Based on your analysis, identify the **top duplications by impact** using this scoring:
+
+| Factor | Points |
+|--------|--------|
+| >20 duplicate lines | +3 |
+| Affects security-critical path | +3 |
+| In file >1000 lines (maintenance burden) | +2 |
+| More than 2 copies | +2 |
+| Easy to extract (no complex dependencies) | +1 |
+
+Report only findings with score ≥ 4.
+
+### For each high-impact finding, create an issue with this format:
+
+**Title**: `[Duplicate Code] <brief description of what is duplicated>`
+
+**Body**:
+```markdown
+## Duplicate Code Opportunity
+
+### Summary
+- **Pattern**: Brief description of what is being duplicated
+- **Locations**: File(s) and line ranges containing duplicates
+- **Impact**: Lines saved / maintenance burden reduction
+
+### Evidence
+
+<Show the specific duplicated code blocks side by side>
+
+### Suggested Refactoring
+
+Describe the shared utility or abstraction that would eliminate the duplication.
+For example:
+- Extract a `parseEnvVars(obj)` helper in `src/env-utils.ts`
+- Create a base class or mixin for provider adapters
+- Add a `buildDockerArgs(config)` factory function
+
+### Affected Files
+- `path/to/file.ts` — lines X-Y
+- `path/to/other.ts` — lines A-B
+
+### Effort Estimate
+Low / Medium / High
+
+---
+*Detected by Duplicate Code Detector workflow. Run date: $(date -u +"%Y-%m-%d")*
+```
+
+## Guidelines
+
+- **Be specific**: Always include file paths and line numbers in the evidence section
+- **Be actionable**: Each issue should have a clear, implementable suggestion
+- **Avoid noise**: Only file issues for genuine duplication with real maintenance impact — not cosmetic similarities
+- **No duplicates**: Check existing open issues before creating new ones
+- **Security awareness**: Flag duplicated security-critical logic (domain validation, ACL rules, capability management) with higher urgency
+- **Cap at 5 issues**: File at most 5 issues per run to avoid flooding the tracker
+
+## Edge Cases
+
+- **No significant duplication found**: Exit gracefully without creating issues; print a summary to the log
+- **jscpd unavailable**: Fall back to grep-based pattern analysis only
+- **All findings already tracked**: Skip creation and log that existing issues cover the findings