Fix: OpenCode post-commit hook uses console.error instead of console.log

[notactuallytreyanastasio]

Summary

• Fix OpenCode post-commit reminder plugin using console.log (stdout) instead of console.error (stderr)
• OpenCode TUI captures stdout, causing the deciduous reminder banner to render inline in the display panel
• The pre-edit hook was already fixed in v0.13.7; this catches the post-commit hook that was missed

Files changed

• src/opencode.rs - embedded template (affects future deciduous init/deciduous update)
• .opencode/plugin/post-commit-reminder.ts - already-installed plugin in this repo

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