Adds features.memfs config key that controls whether the Letta Code CLI
receives --memfs or --no-memfs when creating/resuming SDK sessions. This
enables lettabot users to opt into git-backed memory filesystem (context
repositories) for persistent local memory sync.
- Config types: memfs?: boolean on AgentConfig.features, LettaBotConfig.features, BotConfig
- Bot wiring: baseSessionOptions() and createAgent() pass memfs to SDK when defined
- Main wiring: YAML config takes precedence, LETTABOT_MEMFS env var as fallback
- Legacy fix: conversations passthrough in single-agent normalization
- Tests: 3 memfs wiring tests (true/false/undefined), 2 conversations passthrough tests
- Docs: configuration.md section with known limitations, example YAML
Fixes#335
Written by Cameron and Letta Code
"The best way to predict the future is to implement it." -- David Heinemeier Hansson
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