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
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