Snapshot git operations fail with paging file too small under memory pressure

Description

During extended sessions on Windows, git processes spawned by the snapshot system fail with "error launching git: The paging file is too small for this operation to complete." and "fatal: Out of memory, malloc failed". The snapshot code at packages/opencode/src/snapshot/index.ts only logs a warning and returns — no retry, no circuit breaker, no user notification. Snapshots silently stop working.

7 occurrences logged between Aug 12–18 in opencode.log. Later occurrences escalated to fatal: Out of memory, malloc failed and die() called many times.

Related: #20695, #42597, #42980

Plugins

N/A

OpenCode version

1.18.x (dev branch)

Steps to reproduce

1. Run opencode on Windows for an extended session (hours) with multiple parallel sessions
2. Under memory pressure, the OS cannot allocate virtual memory for new git child processes
3. Snapshot operations (diff-files, ls-files) fail with "paging file too small"
4. Snapshots silently degrade — no retry, no user notification, undo/revert stop working

Screenshot and/or share link

N/A

Operating System

Windows 11

Terminal

pwsh