hakurei 0.3.6

Fixes:
- Allow devel syscalls in `internal/pkg`.
- Keep objects alive while stopping cleanups in `internal/lockedfile`.
- Cancel on scanner error in `internal/pkg`.
- Stricter checking in `internal/pkg` error filtering.

Enhancements:
- Set scheduling policy in `container`.
- Treat nil pathname as self in `ldd`.
- Use `/proc/self/exe` directly in `container`.
- Deprecate unused APIs and remove `cmd/hpkg`.

Internal:
- Validate tar pathnames in `internal/pkg`.
- Read buffer free list in `internal/pkg`.
- Buffer tar reader in `internal/pkg`.
- Significantly improve error resolution performance in `internal/pkg`.
- Expose extra information for `FileArtifact` pipelines.
- Mount `tmpfs` on `/tmp` in integration test to prevent spurious failures.
- Match `os` package behaviour in `container` package error injection tests.
- Export layer promotion in `internal/pkg`.
- Raise string limit to 16 MiB in `internal/pkg`.
- Supported artifacts in `internal/pkg` now saves logs.
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