refactor: restructure codebase to internal/ directory with modular architecture

- Move all source files to internal/{app,backend,config,executor,logger,parser,utils}
- Integrate third-party libraries: zerolog, goccy/go-json, gopsutil, cobra/viper
- Add comprehensive unit tests for utils package (94.3% coverage)
- Add performance benchmarks for string operations
- Fix error display: cleanup warnings no longer pollute Recent Errors
- Add GitHub Actions CI workflow
- Add Makefile for build automation
- Add README documentation

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Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

codeagent-wrapper/internal/logger/wrapper_name.go

@@ -0,0 +1,13 @@
+package logger
+
+// WrapperName is the fixed name for this tool.
+const WrapperName = "codeagent-wrapper"
+
+// CurrentWrapperName returns the wrapper name (always "codeagent-wrapper").
+func CurrentWrapperName() string { return WrapperName }
+
+// LogPrefixes returns the log file name prefixes to look for.
+func LogPrefixes() []string { return []string{WrapperName} }
+
+// PrimaryLogPrefix returns the preferred filename prefix for log files.
+func PrimaryLogPrefix() string { return WrapperName }