hakurei 0.3.5

Fixes:
- Filter host-dependent mount options in test cases.

Enhancements:
- Include target in dist filename.
- Add riscv64 constants.

Internal:
- Allow multiarch in `execArtifact`.
- Set project-specific User-Agent in `httpArtifact`.
- Artifact IR is now standardised for `internal/pkg`.
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