Feature Request

Problem

Currently, Log.init creates a new log file on every startup (timestamped filename like 2026-02-10T142345.log). For long-running sessions or server deployments, this means:

• Logs from the same day are split across multiple files
• No way to customize the log directory
• Cleanup is based on file count, not time-based retention

Proposed Solution

Introduce a rotate option to Log.Options with pluggable strategies:

• startup (default) — current behavior, one file per startup, retain N files
• daily — one file per day (opencode-YYYY-MM-DD.log), same-day restarts append, retain N days

Also add an optional path field to override the default log directory.

Both are controlled via environment variables:

• OPENCODE_LOG_PATH — custom log directory
• OPENCODE_LOG_ROTATE=daily — enable daily rotation
• OPENCODE_LOG_RETENTION=N — retention count

Why

Useful for server deployments on cloud: you can customize the log path to integrate with cloud provider log systems (e.g., CloudWatch, Cloud Logging) for easier log collection and querying.