chore(deps): update dependency agh/cwtch to v5

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This PR contains the following updates:

Package	Update	Change
agh/cwtch	major	v4.0.4 -> v5.0.0
agh/cwtch	major	v4.0.4tar.gz -> v5.0.0

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Release Notes

agh/cwtch (agh/cwtch)

v5.0.0

Compare Source

Added

• claude-switch script for switching between Claude Code accounts
• install.sh script for symlinking utilities to ~/.local/bin
• shellcheck and editorconfig configuration
• CLAUDE.md project context file
• MIT license
• bats test suite
• GitHub Actions CI (shellcheck, shfmt, tests)

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