feat: add --path flag to create command for streamlined navigation

[laysakura]

Summary

• Added --path flag to sprout create command that outputs only the worktree path
• Enables one-liner usage: cd $(sprout create feature --path)
• Improves developer workflow by combining creation and navigation in a single command

Changes

• Modified create command to accept --path boolean option
• Updated output behavior to print only path when flag is used
• Added silent mode to parse_env_template to avoid mixing prompts with path output
• Updated README with new one-liner usage pattern
• Added comprehensive tests for the new flag behavior
• Updated CHANGELOG.md with the new feature

Test plan

• Run sprout create test-branch --path and verify it outputs only the path
• Test one-liner usage: cd $(sprout create test-branch --path)
• Verify error messages go to stderr when using --path flag
• Confirm normal behavior without --path flag remains unchanged
• All unit tests pass with make test
• Code passes linting with make lint
• Manual testing of various edge cases (non-git repo, existing worktree, etc.)

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