core: V1 migration fails on every startup with SQLiteError: near ",": syntax error

Summary

On every opencode2 startup, the server logs V1 migration failed with SQLiteError: near ",": syntax error while running the V1→V2 database migration. The service still starts and is usable, but the V1 migration never completes, so legacy data is presumably never migrated.

Environment

• opencode version: 0.0.0-next-17403
• OS: Linux 5.15.153.1-microsoft-standard-WSL2 (linux x64)
• Terminal: TERM=xterm-256color, COLORTERM=truecolor
• Shell: /bin/bash
• Install/channel: next
• Active plugins: herdr-agent-state.js (global, ~/.config/opencode/plugins/), herdr-tui-session.js (via tui.jsonc plugin entry)

Reproduction

1. Have an existing install with a pre-V2 SQLite database (upgraded in place from a V1-era version).
2. Start opencode2 (or let the background service start).
3. Observe the server log.

Expected Behavior

The V1→V2 migration runs successfully (or reports a meaningful, actionable failure).

Actual Behavior

The server logs an unhelpful SQL syntax error from the V1 migration path on every startup:

timestamp=2026-08-28T03:49:52.550Z level=ERROR run=7882e373 message="V1 migration failed" cause="Cause([Die(SQLiteError: near \",\": syntax error)])" role=server

This has occurred on three separate startups (2026-08-15 14:02, 2026-08-15 18:36, 2026-08-28 03:49), i.e. it is consistent and not transient. The built-in Drizzle migrations before it (20260811161259_execution_claim_attempts, 20260812181746_session_inbox, 20260812213948_worktree) all complete successfully in milliseconds, so the failure is specific to the V1 migration step, which appears to generate malformed SQL (a stray comma).

Additional Context

• The failure occurs before any project copy refresh, every time the background service starts.
• The client still connects and sessions work; the visible impact is the failed V1 migration (legacy data not migrated) plus the recurring ERROR log.
• Searched existing issues: #41739 hits the same V1 migration code path but fails differently (large-DB stall / database is locked), and #41346 is referenced there as distinct. I did not find a report of the near ",": syntax error variant.
• All config files (opencode.json, tui.json, tui.jsonc, cli.json, service.json) parse as valid JSON, ruling out config syntax as the cause.
• Log file: ~/.local/share/opencode/log/opencode.log
• Version detail: client started with version=0.0.0-next-17403 channel=next, an update check found 0.0.0-beta-18414 available (automatic update skipped: installation method not found).