opencode-archive-before-compaction

OpenCode plugin that archives the full session transcript immediately before compaction, then injects a reference to the archive folder into the compaction context so agents can search it later (e.g., via grepai).

What it does

- Writes archives under: .opencode/archive/sessions//
- Creates timestamped .md (human readable) and .json (exact)
- De-dupes identical archives via SHA256
- Adds a compaction note pointing at the archive folder and recommending searching it with grepai

Install (OpenCode config)

In your opencode.json:

```json
{
"plugin": ["opencode-archive-before-compaction"]
}