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New internal/sessions package with Handler bridging 7 REST endpoints to: - POST /memory/ingest on poimen-memory:8080 (writes) - GraphQL hybridSearch/entity on poimen-graphql:8090 (reads) Adapter registration: X-Service: sessions with resources sessions, session, milestones, episodes, episode. IDs via query params (?session_id=, ?episode_id=) — dispatcher does not substitute path params. episode_id = sha256(session_id+milestone_id+attempt) per §4.14 Q6. Content JSON-encoded (prevents key:value injection on user fields). Limit capped at 200. GraphQL error body detected and surfaced as 502. tracing.NewTransport wired for cross-service trace propagation. JWT forwarded to both upstreams for auth. 30 tests in handler_test.go covering all 7 handlers + EpisodeID helper. Closes #50