feat(memory): add agent_memory table and memory-tools plugin

[herjarsa]

Issue for this PR

Closes #41998

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds the \�gent_memory\ table and \memory-tools\ plugin for cloud backup/restore of OpenCode AgentMemory via Supabase.

Changes:

1. Database: \�gent_memory\ table with FTS5 full-text search and tags support
2. AgentMemory Service: Effect-based service with save, search, consolidate operations
3. memory-tools Plugin: 5 tools for cloud sync:
   • \memory.configure\ - Configure Supabase connection
   • \memory.backup\ - Push local memories to cloud
   • \memory.restore\ - Pull cloud memories to local (merge)
   • \memory.status\ - Show sync status
   • \memory.schedule\ - Get/set auto-sync interval

Cloud sync features:

• Conflict resolution: newest wins by timestamp
• Auto-scheduler with configurable intervals (5m, 15m, 1h, 1d, manual)
• Works with existing OpenCode AgentMemory data

Files Changed

File	Purpose
\packages/memory-tools/src/index.ts\	Plugin entry with 5 tool definitions
\packages/memory-tools/src/sync.ts\	Cloud sync (backup/restore) with Supabase
\packages/memory-tools/supabase/migrations/001_agent_memory.sql\	SQL migration reference
\packages/opencode/src/session/memory.ts\	AgentMemory service (save, search, consolidate)
\packages/opencode/migration/20260425194233_agent_memory/\	Drizzle migration

How did you verify your code works?

• TypeScript compiles without errors in memory-tools package
• All Bun.sqlite bindings use proper type casts
• Plugin follows the correct \Plugin\ interface from @opencode-ai/plugin
• Code follows OpenCode module conventions (Effect, self-export pattern)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

I encountered API access issues when trying to search for duplicate PRs. However, based on the PR details provided:

• PR feat(memory): add agent_memory table and memory-tools plugin #42425: feat(memory): add agent_memory table and memory-tools plugin
• Issue closed: feat(memory): add agent_memory table and memory-tools plugin #41998

Without successful search results, I cannot definitively identify duplicate PRs. To complete this check:

1. You could manually search on GitHub for PRs with keywords like "memory-tools", "agent_memory", or "memory backup"
2. Check issue feat(memory): add agent_memory table and memory-tools plugin #41998 for any linked PRs
3. Review recent PRs in the packages/memory-tools and packages/opencode directories

If you can retry the search or have access to search results, please share them and I can help identify any related work.