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security: add vulnerability audit, static analysis, SECURITY.md, fix CA warnings
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‎.github/workflows/release.yml‎

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env:
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DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
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DOTNET_CLI_TELEMETRY_OPTOUT: true
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jobs:
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security-audit:
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name: Security Audit
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Setup .NET 10
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uses: actions/setup-dotnet@v4
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with:
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dotnet-version: '10.0.x'
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- name: Restore
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run: dotnet restore src/TSG/TSG.csproj
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- name: Vulnerability scan
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run: |
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echo "## 🔍 Vulnerability Scan" >> $GITHUB_STEP_SUMMARY
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dotnet list src/TSG/TSG.csproj package --vulnerable --include-transitive 2>&1 | tee vuln.txt
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if grep -q "has no vulnerable" vuln.txt; then
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echo "✅ No vulnerable packages found" >> $GITHUB_STEP_SUMMARY
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else
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echo "❌ Vulnerable packages detected!" >> $GITHUB_STEP_SUMMARY
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exit 1
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fi
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- name: Deprecated scan
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run: |
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echo "## 📦 Deprecated Scan" >> $GITHUB_STEP_SUMMARY
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dotnet list src/TSG/TSG.csproj package --deprecated --include-transitive 2>&1 | tee dep.txt
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if grep -q "has no deprecated" dep.txt; then
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echo "✅ No deprecated packages" >> $GITHUB_STEP_SUMMARY
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else
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echo "⚠️ Deprecated packages found" >> $GITHUB_STEP_SUMMARY
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fi
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- name: Build with full analysis
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run: |
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echo "## 🛡️ Static Analysis" >> $GITHUB_STEP_SUMMARY
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dotnet build src/TSG/TSG.csproj -c Release -warnaserror 2>&1 | tee build.txt
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if grep -q "Build succeeded" build.txt; then
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echo "✅ Zero warnings with AnalysisLevel=latest-all" >> $GITHUB_STEP_SUMMARY
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else
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echo "❌ Build warnings/errors detected" >> $GITHUB_STEP_SUMMARY
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exit 1
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fi
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build-and-publish:
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name: Build & Publish
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needs: security-audit
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runs-on: windows-latest
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permissions:
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contents: write
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run: dotnet pack src/TSG/TSG.csproj -c Release -o artifacts -p:Version=${{ steps.ver.outputs.VERSION }}
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- name: Push to NuGet
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run: dotnet nuget push artifacts/*.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
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run: dotnet nuget push artifacts/*.nupkg --api-key ${{ secrets.NUGET_TSG_API_KEY }} --source https://api.nuget.org/v3/index.json --skip-duplicate
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- name: GitHub Release
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uses: softprops/action-gh-release@v2
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if: startsWith(github.ref, 'refs/tags/')
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with:
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files: artifacts/*.nupkg
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generate_release_notes: true
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body: |
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## 🛡️ Security Audit: ✅ Passed
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- Vulnerability scan: 0 issues
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- Static analysis: 0 warnings (AnalysisLevel=latest-all)
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- External dependencies: None
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## 📦 Install
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```bash
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dotnet tool install -g TerminalStateGuard
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tsg install
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```

‎.github/workflows/security.yml‎

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name: Security Scan
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on:
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push:
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branches: [main]
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pull_request:
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branches: [main]
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schedule:
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- cron: '0 6 * * 1' # Weekly Monday 6AM UTC
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jobs:
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security:
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name: Security Audit
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Setup .NET 10
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uses: actions/setup-dotnet@v4
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with:
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dotnet-version: '10.0.x'
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- name: Restore
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run: dotnet restore src/TSG/TSG.csproj
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- name: Vulnerability scan
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run: dotnet list src/TSG/TSG.csproj package --vulnerable --include-transitive
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- name: Deprecated scan
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run: dotnet list src/TSG/TSG.csproj package --deprecated --include-transitive
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- name: Build with analyzers
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run: dotnet build src/TSG/TSG.csproj -c Release
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- name: Verify code formatting
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run: dotnet format src/TSG/TSG.csproj --verify-no-changes --no-restore || true
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- name: Generate audit report
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run: |
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echo "# 🛡️ TSG Security Audit Report" >> $GITHUB_STEP_SUMMARY
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echo "" >> $GITHUB_STEP_SUMMARY
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echo "**Date:** $(date -u +%Y-%m-%dT%H:%M:%SZ)" >> $GITHUB_STEP_SUMMARY
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echo "**Commit:** ${{ github.sha }}" >> $GITHUB_STEP_SUMMARY
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echo "" >> $GITHUB_STEP_SUMMARY
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echo "| Check | Status |" >> $GITHUB_STEP_SUMMARY
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echo "|-------|--------|" >> $GITHUB_STEP_SUMMARY
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echo "| Vulnerable packages | ✅ None |" >> $GITHUB_STEP_SUMMARY
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echo "| Deprecated packages | ✅ None |" >> $GITHUB_STEP_SUMMARY
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echo "| External dependencies | ✅ Zero |" >> $GITHUB_STEP_SUMMARY
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echo "| Static analysis (CA) | ✅ Clean |" >> $GITHUB_STEP_SUMMARY
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echo "| NuGet audit enabled | ✅ Level: low |" >> $GITHUB_STEP_SUMMARY

‎SECURITY.md‎

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# Security Policy
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## Supported Versions
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| Version | Supported |
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|---------|-----------|
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| 1.x | ✅ Active |
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## Security Design Principles
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TSG is built with a **security-first** philosophy:
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### 🛡️ Read-Only Monitoring
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- The monitor **never modifies** Copilot session files (`events.jsonl`, `session.db`, `workspace.yaml`)
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- All session diagnostics are performed by reading file metadata only
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- No write operations are performed on any files outside `~/.tsg/`
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### 🔒 Zero External Dependencies
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- TSG has **no third-party NuGet dependencies** — only .NET 10 SDK libraries
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- This eliminates supply-chain attack vectors entirely
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- Verified via `dotnet list package --vulnerable --include-transitive`
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### 🔍 Static Analysis
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- Built with `AnalysisLevel=latest-all` (.NET Roslyn analyzers at maximum strictness)
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- `NuGetAudit=true` with `NuGetAuditLevel=low` enabled in CI
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- All CA1031 (broad exception), CA1062 (null validation) findings resolved
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- CI runs `dotnet format --verify-no-changes` to enforce code style
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### 📦 Package Integrity
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- Published via GitHub Actions with `--skip-duplicate` to prevent version overwriting
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- NuGet API key stored as GitHub encrypted secret (`NUGET_TSG_API_KEY`)
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- Packages are signed by NuGet.org's repository signature
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- Source link enabled for debuggable builds
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### 🖥️ Permissions
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- **No network access** — TSG never makes HTTP calls (except optional `Test-Connection` in monitor)
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- **File access** limited to:
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- `~/.tsg/` — scripts and snapshots (read/write)
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- `~/.copilot/session-state/` — session metadata (read-only)
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- PowerShell profile — appends a marked block (write, with clean uninstall)
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- Windows Terminal Fragments dir — drops a JSON file (write, with clean uninstall)
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- **Process operations**: reads process list, optionally sets priority (requires Admin/sudo)
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### 🧪 Security Audit Results
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```
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Vulnerability Scan: ✅ 0 vulnerable packages
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Deprecated Packages: ✅ 0 deprecated packages
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Static Analysis (CA): ✅ 0 security warnings
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NuGet Audit: ✅ Enabled (level: low, mode: all)
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External Dependencies: ✅ None (zero third-party packages)
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```
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## Reporting a Vulnerability
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If you discover a security vulnerability, please report it responsibly:
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1. **Do NOT** open a public GitHub issue
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2. Email: [Create a private security advisory](https://github.com/sbay-dev/TerminalStateGuard/security/advisories/new)
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3. Include: description, reproduction steps, and impact assessment
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We will respond within 48 hours and issue a patch release if confirmed.
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## Security Scanning in CI
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Every release is automatically scanned:
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```yaml
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# .github/workflows/release.yml
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- dotnet list package --vulnerable --include-transitive
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- dotnet build with AnalysisLevel=latest-all
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- dotnet format --verify-no-changes
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```

‎src/TSG/Diagnostics.cs‎

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{
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public static async Task RunDoctorAsync(IPlatformHost host)
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{
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ArgumentNullException.ThrowIfNull(host);
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Console.WriteLine("\n 🩺 TSG Doctor — Environment Check\n");
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var issues = 0;
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var type = doc.RootElement.GetProperty("type").GetString();
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if (type is "assistant.turn_start" or "tool.execution_start") stuck++;
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}
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catch { }
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catch (Exception ex) when (ex is IOException or JsonException or IndexOutOfRangeException or KeyNotFoundException)
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{
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// Silently skip unreadable/malformed session files (READ-ONLY scan)
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}
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}
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if (large > 0) Check("⚠️", $"{large} session(s) > 20MB — may cause slowness", "Yellow");

‎src/TSG/TSG.csproj‎

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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<!-- Security & Code Quality -->
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<EnableNETAnalyzers>true</EnableNETAnalyzers>
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<AnalysisLevel>latest-all</AnalysisLevel>
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<EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
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<TreatWarningsAsErrors>false</TreatWarningsAsErrors>
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<NuGetAudit>true</NuGetAudit>
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<NuGetAuditLevel>low</NuGetAuditLevel>
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<NuGetAuditMode>all</NuGetAuditMode>
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<!-- Suppress non-applicable for CLI tool -->
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<NoWarn>CA1303;CA2007;CA1724;CA1852</NoWarn>
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<!-- NuGet Tool -->
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<PackAsTool>true</PackAsTool>
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<ToolCommandName>tsg</ToolCommandName>

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