hakurei 0.4.8

Fixes:
- Resolve output defers in `internal/rosa`.

Enhancements:
- Enter init path early in `container`.
- Optionally load built-ins from filesystem in `internal/rosa`.
- Treat bare carriage return as end-of-line marker in `internal/pkg`.
- Remove arch snapshot API from `internal/pkg`.
- Export package `internal/pkg`.
- Destroy stale instances via `internal/store`.

Internal:
- Discontinue `riscv64` support in `internal/rosa`.
- Include early-runtimes for gentoo stage only in `internal/rosa`.
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