Note

Structure Tailscale command failures into typed error classes with sanitized context

• Replaces the generic TailscaleCommandError helper with four distinct Schema.TaggedErrorClass types: TailscaleCommandSpawnError, TailscaleCommandOutputError, TailscaleCommandExitError, and TailscaleCommandTimeoutError, each carrying structured context (executable, subcommand, argument count, and relevant metrics).
• Exit errors expose only stdoutLength/stderrLength instead of raw stdio content, and timeout errors include timeoutMs derived from the Duration input.
• TailscaleStatusParseError is also migrated to Schema.TaggedErrorClass with a fixed message and a Defect cause, avoiding raw error text in the message.
• Behavioral Change: error messages and types surfaced by readTailscaleStatus, ensureTailscaleServe, and disableTailscaleServe all change; callers relying on the previous error shape or message strings will break.

^{Macroscope summarized 1db0e32.}