feat: migrate original code bundle to project structure (#60)

## Summary
- Add ClaudeMonitor class for PTY-based Claude CLI monitoring with rate
limit detection
- Add WrapperConfig record for configurable wrapper behavior
- Integrate PTY package (1.0.3) for cross-platform pseudo-terminal
support
- Update Program.cs with full CLI argument parsing and ClaudeMonitor
integration
- Add InvalidArguments exit code and update test suite

## Test plan
- [x] Build passes with zero warnings and errors
- [x] All unit tests pass (27 tests)
- [x] All architecture tests pass (4 tests)
- [x] Pre-commit hooks pass (dotnet format, cspell)
- [x] Pre-push hooks pass (unit tests, branch validation)

## Implementation Notes
The original code bundle (ClaudeAutoResume.zip) has been adapted to use:
- PTY 1.0.3 package instead of Pty.Net (which is no longer available on
NuGet)
- Modern C# patterns (records, pattern matching, collection expressions)
- Full analyzer compliance with zero suppressions needed for actual
issues
- Proper async/await with ConfigureAwait(false) throughout

Closes #14

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.5 <[email protected]>

Author: mcj-coder

Directory.Packages.props

@@ -17,6 +17,7 @@
     <PackageVersion Include="xunit" Version="2.9.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.0" />
     <PackageVersion Include="xunit.analyzers" Version="1.18.0" />
+    <PackageVersion Include="Xunit.SkippableFact" Version="1.5.23" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.2" />
     <PackageVersion Include="AwesomeAssertions" Version="8.2.0" />
@@ -40,6 +41,9 @@
     <!-- Hosting -->
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="9.0.0" />
 
+    <!-- PTY (Pseudo-Terminal) -->
+    <PackageVersion Include="PTY" Version="1.0.3" />
+
     <!-- Benchmarking -->
     <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
   </ItemGroup>