seQ v0.1.0-rc4

Adds renewal arrivals (arrive renewal(gap)) and finite open workloads (run { arrivals N; }, --arrivals).

Breaking: the crate's modules are regrouped under frontend, engine, ir and view with no re-exports of the old paths (seq::parser is now seq::frontend::parser); programs/ moved to examples/<workload>/; seq-lang draw drops the session view together with --view and --show-set.

What's Changed

• refactor: programs/ → examples/<워크로드>/ 로 재배치 by @vrvrv in #103
• chore: remove editors/ by @vrvrv in #105
• refactor: src/를 frontend/ sim/ view/ ir/ 로 분리 by @vrvrv in #106
• feat: support renewal arrivals and finite open workloads by @vrvrv in #107
• docs: 네 갈래 nav와 구성요소별 API Reference by @vrvrv in #109
• refactor(draw): session view 제거 by @vrvrv in #110
• chore(release): v0.1.0-rc4 by @vrvrv in #111

Full Changelog: v0.1.0-rc3...v0.1.0-rc4