[FEATURE]:`--continue-all` flag to auto-resume all incomplete sessions

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Describe the enhancement you want to request

Feature Request: --continue-all flag to auto-resume all incomplete sessions

Summary

Add a --continue-all flag (or --auto-resume) that automatically detects and resumes all sessions where the assistant's reasoning was interrupted (last message is from assistant role).

Use Case

When OpenCode is restarted (after a crash, system reboot, or just a new day), users often have multiple sessions with unfinished assistant responses. Currently:

• opencode -c only continues the last session
• opencode -s <id> requires knowing the session ID manually
• There's no built-in way to see which sessions are "incomplete"

Proposed Behavior

opencode --continue-all

On startup, this flag would:

1. Query all sessions where time_archived IS NULL
2. For each session, check if the last message.role == 'assistant' (meaning the assistant was mid-response)
3. Present a selection menu or automatically resume all of them in separate tabs/windows

Alternative: --auto-resume (quiet mode)

opencode --auto-resume

Same as above, but skips the menu and auto-opens all incomplete sessions without user interaction.

Current Workaround

I've written a PowerShell script that queries the SQLite DB directly:

$sessions = opencode session list --format json | ConvertFrom-Json
foreach ($s in $sessions) {
    $lastMsg = sqlite3 $dbPath "SELECT data FROM message WHERE session_id='$($s.id)' ORDER BY time_created DESC LIMIT 1"
    $data = $lastMsg | ConvertFrom-Json
    if ($data.role -eq "assistant") {
        Start-Process opencode -ArgumentList "-s $($s.id)"
    }
}

But this requires:

• External sqlite3 binary
• Manual DB path discovery
• Launching multiple processes

Additional Context

This would be especially useful for:

• Desktop app users who work on multiple tasks simultaneously
• Users who frequently restart their system
• Teams sharing sessions who need to pick up where others left off

Environment

• OpenCode Desktop v1.18.22 (Windows)
• Also affects CLI usage

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Thank you for considering this feature!