* chore(memory): remove plugin block from opencode.json
* chore(memory): remove setup-memory.sh and memory-setup.ts
* chore(memory): remove opencode-memory from Dockerfile
* docs(memory): update AGENTS.md and SKILL.md for new tools
* test(memory): drop tests for removed setup-memory.sh and memory-setup.ts
* docs(handoff): add handoff and ADR-045 for plugin/rust removal
* docs(handoff): set PR number
* docs(project-map): update after plugin/rust removal
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Co-authored-by: opencode-agent <agent@opencode.local>
