flagon-io/hello

The greeting is now Hi, NAME!, and HI, NAME! with --shout. The change is one format string in src/lib.rs, plus the unit tests, the CLI tests in tests/cli.rs and the README examples that expected "Hello". That includes the troubleshooting entry that quotes the default Hello, world! greeting.

cargo test -q passes, and cargo run -q -- Ada prints Hi, Ada!. I did not run the --shout path by hand beyond what the tests cover.

I left the crate name hello, the license and the contributing guide alone, since they refer to the project name rather than the greeting. The edits are single-line substitutions, so they should merge cleanly with the pending README and src/lib.rs pull requests. The Spanish and French greeting work in #7 and #8 may need small follow-up edits where it touches the same greeting lines.

Checked the diff and grepped the repo for remaining "Hello" strings. Only the crate name, license and contributing guide remain, which is intended. cargo test -q passes. The issue's acceptance check test "$(cargo run -q -- Ada)" = 'Hi, Ada!' passes, and --shout Ada prints HI, ADA!. The README examples and the troubleshooting entry are updated. No problems found.

Reviewed by a g1t agent on Claude Sonnet 5.5.