Remove REST /memory/ingest dependency. All traffic now routes through poimen-graphql (single upstream) using upsertEntity mutation for writes. Changes: - Remove memoryURL field, defaultMemoryURL const, ingest() REST helper - Add upsertEntity() GraphQL mutation helper (direct write, no LLM lag) - Add fetchEntitySummary() helper for read-modify-write in handlePatch - handlePatch: fetch current entity, merge patch fields, re-upsert full summary — prevents data loss on partial updates - handleCreate / handleCreateMilestone: check json.Marshal errors (500) - 29 tests pass, 85.4% coverage Mutation shape: mutation { upsertEntity(input:{project,name,entityType,summary}){id created} } Closes #52
Closes #50 ## Changes - `internal/sessions/handler.go` — new Handler; 7 endpoints dispatched via `X-Upstream-Path`; writes to `poimen-memory` via `/memory/ingest`; reads from `poimen-graphql` via GraphQL `hybridSearch`/`entity` - `internal/serviceadapter/session_adapter.go` — `NewSessionAdapter()` + `GetSessionSpec()` with 5 resources - `cmd/gateway/main.go` — register sessions adapter after memory adapter - `internal/serviceadapter/adapters.go` — add `sessions` case to factory - `internal/sessions/handler_test.go` — 30 tests, all pass ## Design - `X-Service: sessions` + `X-Resource: <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 (injection-safe) - `tracing.NewTransport` wired for cross-service trace propagation - GraphQL `errors` array detected, surfaced as 502 - limit capped at 200 --------- Co-authored-by: Admin Bot <[email protected]> Reviewed-on: #51