Server mode: InstanceStore never evicts per-directory instances (unbounded memory) #33720

Description

opencode serve keeps one InstanceStore entry per directory (resolved from the x-opencode-directory header) and never frees it — there is no idle TTL, LRU, or max-size eviction in packages/opencode/src/project/instance-store.ts. A long-running server that receives requests for many distinct directories (e.g. a client that uses one directory per session) accumulates one instance per directory for the lifetime of the process. Each instance holds its own file watchers, LSP/MCP subprocesses, plugins and bus subscriptions, so RSS grows without bound until the process is OOM-killed.

Instances are only freed by an explicit POST /instance/dispose, reload, or disposeAll, so a client that never disposes (or crashes first) leaks every directory it has touched.

OpenCode version

1.17.9 (serve)

Steps to reproduce

1. Start opencode serve.
2. Repeatedly create a session and send a prompt, each with a different x-opencode-directory value (one directory per session).
3. RSS of the server climbs linearly with the number of distinct directories and never drops; eventually OOM.

Operating System

Linux (Ubuntu 22.04)