v0.16.0

Configure automatic queueing when launching OpenCode:

OPENCODE_QUEUE_ALWAYS=1 opencode

Use 1, true, or on to enable it, or 0, false, or off to disable it. Values ignore case and surrounding whitespace. Invalid values fail plugin initialization with an error.

When the variable is set, /queue:always-on and /queue:always-off change the setting in memory for the current project's plugin instance. They leave the saved global setting and other instances alone. Sessions within that instance share the setting, and restarting restores the environment value.

With the variable unset or empty, runtime commands retain their existing globally saved behavior. /queue:always reports the effective value and scope.

Prompts still send normally while idle and queue while busy, stopped, or waiting on queued input. /queue:now bypasses automatic queueing.

Addresses the noninteractive configuration request in #5.