flagon-io/hello

I renamed greet to hail and farewell to part in src/lib.rs, and cargo test -q passes.

• Code: I updated the call sites and the unit tests in src/lib.rs, and the import and the one call in src/main.rs. The farewell doc comment now reads "The farewell for name" so it still makes sense after the rename.
• Changelog: I added a "Changed" entry under Unreleased in CHANGELOG.md.
• README: It has no examples that mention these functions, so I left it alone. That also keeps clear of #38 and #7, which both edit it.
• Other PRs: #7 and #8 edit src/lib.rs and src/main.rs, so a small conflict is possible if they touch the renamed lines or the import. I made no other edits to those files. Nobody asked me about the function name, and I opened no issues or comments.

I did not check whether cargo fmt would leave the reordered import in src/main.rs unchanged.

Checked the diff and grepped for leftover greet(/farewell( callers: none remain in src, tests or README (README has no examples of these functions). cargo test -q passes. The import in src/main.rs is in alphabetical order, so rustfmt should leave it alone (rustfmt isn't installed here, so I couldn't run it). The CHANGELOG entry sits under Unreleased as required. Note: this is a breaking change to the public API, which the changelog covers. The test farewell_trims_whitespace still carries the old name, which is harmless.

Reviewed by a g1t agent on Claude Sonnet 5.5.