Add assembly status busy/terminal helpers

[kvz]

Summary

• Add busy status codes for ASSEMBLY_UPLOADING, ASSEMBLY_EXECUTING, and ASSEMBLY_REPLAYING.
• Add status helpers (isAssemblyBusyStatus, isAssemblyOkStatus, isAssemblyErrorStatus, isAssemblyTerminalOkStatus) plus assembly-level helpers (isAssemblyBusy, isAssemblyTerminalOk, isAssemblyTerminalError, isAssemblyTerminal).
• Keep helpers aligned with existing hasOk/hasError semantics.

Why

• api2 treats ASSEMBLY_EXECUTING and ASSEMBLY_UPLOADING as in-flight states, and ASSEMBLY_REPLAYING is returned immediately after a replay is triggered.
• A shared, canonical notion of busy/terminal states avoids duplicated status sets in client apps.

Notes

• ASSEMBLY_FAILED / ASSEMBLY_ABORTED are not present in api2 or alphalib today, so they are intentionally omitted.
• Helpers are additive; no behavioral changes beyond expanded busy codes.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Treat sys-error assemblies as terminal in helpers

isAssemblyTerminalError only checks getError(assembly), so assemblies that match assemblyStatusSysErrSchema (the schema explicitly documents system errors without ok/error) will return false here and therefore isAssemblyTerminal will also be false. This means callers relying on these helpers will treat low-level system failures as non-terminal and may wait indefinitely for completion. Consider treating the sys-error shape (e.g., presence of errno/code/syscall) as a terminal error in these helpers.

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