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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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