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circleci

ci: Add goveralls coverage upload and improve test coverage (#55)

Add goveralls upload step to CircleCI for Coveralls integration.
Improve test coverage across all packages with comprehensive unit tests.

## Changes

### CI/CD
- Add goveralls coverage upload step to CircleCI
- Merge coverage profiles from all packages (was only saving last)
- Filter out main.go and test/ package from coverage report
- Add go:nocovline comments for hard-to-test paths (os.Exit, SSH errors)

### Test Coverage Improvements

**common package (91.8% coverage)**
- Add tests for SetKnownHosts and SetInsecureHost options

**ops package (92.7% coverage)**
- Add unit tests for copy.go helper functions (sendEndDir, sendDir, sendByte, processError)
- Add error path tests for cmd.go and copy.go
- Add tests for executeCmd and executeCopy error scenarios

**cmd package (85.5% coverage)**
- Add tests for RootCmd, SSH command, and SCP command
- Test command structure, flags, and argument validation
- Test initConfig() function
- Test Run functions and command initialization

Signed-off-by: Ricardo Aravena <raravena80@gmail.com>

6 of 12 new or added lines in 4 files covered. (50.0%)

379 of 419 relevant lines covered (90.45%)

1.03 hits per line