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The Agent now owns its Conversation and a SessionStore, and persists
everything it generates as turns progress. Embedders get persistence for
free; the CLI no longer drives the session log.
libpanto:
- Agent.init takes a SessionStore + optional Conversation to adopt (resume
path). Agent owns/tears down the conversation; turn-driving methods drop
the *Conversation param and operate on self.conversation.
- New Agent methods: submitUserMessage (adds+persists the user prompt
immediately), addSystemMessage(text, mode), runStep persists the turn on
every exit path (incl. partial turns on error), compactAndPersist for the
explicit /compact path. Auto-compaction persists its window via runStep's
tail.
- turn_persist.zig: DiskMessage mapping moved out of the CLI; reads usage
off Message.usage (no per-message-usage list). System mode rides on
DiskMessage.mode, derived from the System block.
- NullStore is now an allocator-bearing struct (frees consumed messages per
the store-consumes-messages contract).
- Tests: in-memory CapturingStore round-trip + NullStore turn test.
panto CLI:
- Delete src/session_persist.zig. REPL is submitUserMessage + runStep.
- Reorder construction: store -> registry -> agent -> bootstrap -> seed/
reconcile system prompt through the agent -> load extensions.
- command.Context drops conv/session_mgr; commands reach ctx.agent.
- system_prompt seed/reconcile call agent.addSystemMessage.
- CLIReceiver is display-only (per_message_usage removed).
Phases 3-5 of docs/pluggable-session-store.md. Behavior preserved; full
build + test suite green.
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Introduce a neutral persistence seam (session_store.zig) following the
{ptr, vtable} shape of the other libpanto seams. The interface traffics in
DiskMessage so non-JSONL backends (e.g. Postgres) can implement it.
- session_store.zig: SessionStore vtable (appendMessages, loadConversation,
sessionId, activeModel), LoadedSession{conversation, dangling_user},
re-exported disk types, and an FSJSONLStore alias.
- session_manager.zig: add store() wrapper + loadConversation() with
dangling trailing-user detection (excluded from the rebuilt conversation,
returned as dangling_user).
- null_store.zig: no-op backend, stateless singleton.
- root.zig: export session_store + null_store.
Phase 1+2 of docs/pluggable-session-store.md. Behavior-preserving; CLI not
yet rewired.
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