Migrate to Rust edition 2024 by renaming gen module to generator

[Copilot]

Rust edition 2024 reserves gen as a keyword, breaking compilation of the gen module and any variables named gen.

Changes

• Cargo.toml: Updated edition from 2021 to 2024
• Module rename: src/gen.rs → src/generator.rs
• Import updates: All references to crate::gen and flakeid::gen changed to use generator
• Variable renames: gen variables renamed to generator in tests, examples, and doc comments

Example

// Before (edition 2021)
use flakeid::gen::FlakeGen;
let mut gen = FlakeGen::with_mac_addr()?;

// After (edition 2024)
use flakeid::generator::FlakeGen;
let mut generator = FlakeGen::with_mac_addr()?;

The API surface remains unchanged—only the module path and variable naming patterns differ.

Original prompt

Update this crate to use Rust edition 2024 instead of 2021. This requires renaming the gen module since gen becomes a reserved keyword in Rust edition 2024.

Required Changes

1. Update Cargo.toml

   • Change edition = "2021" to edition = "2024" on line 5

2. Rename the module file

   • Rename src/gen.rs to src/generator.rs

3. Update module declaration in src/lib.rs

   • Change pub mod gen; to pub mod generator; on line 10

4. Update imports throughout the codebase

   • In src/seq.rs: Change use crate::gen::FlakeErr; to use crate::generator::FlakeErr;
   • In examples/generate.rs: Change use flakeid::gen::FlakeGen; to use flakeid::generator::FlakeGen;

5. Update documentation references

   • In the renamed src/generator.rs file, update any doc comments that reference the gen module to reference generator instead
   • Specifically in the doc examples around lines 18-22 and 32-37 that show use flakeid::gen::FlakeGen; should be changed to use flakeid::generator::FlakeGen;

The module functionality remains unchanged - this is purely a renaming to avoid the gen keyword conflict introduced in Rust edition 2024.

This pull request was created from Copilot chat.

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