fix: rename SimpleRng::next_u32 to next

[Lukasz-Juranek]

Summary

• Renamed SimpleRng::next_u32 to SimpleRng::next in src/kyron/src/time/mod.rs (test-only code)
• The function returns u64, not u32, making the previous name misleading
• Updated all 3 call sites: gen_range() and 2 direct usages in fuzzy tests

Test plan

• bazel test //src/kyron:tests — PASSED before and after fix
• bazel test //... — all 8 test targets PASSED
• bazel build //... — full build SUCCESS
• Format checks (rustfmt, ruff, buildifier, yamlfmt) — all PASSED

Closes #13

🤖 Generated with Claude Code

[github-actions]

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INFO: Build completed successfully, 17 total actions
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usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
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       [-timeout <seconds>] [-token <token>]

[github-actions]

The created documentation from the pull request is available at: docu-html

[pawelrutkaq]

next is clashing with the iterator name and was failing on some clippy. I wonder why it does not clash now. https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next

maybe next_64 or someother name ?

[Lukasz-Juranek]

@pawelrutkaq all green please take a look