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Closes #52 ## Summary Migrates all session/milestone writes from REST `/memory/ingest` to GraphQL `upsertEntity` mutation — direct, typed, no LLM extraction lag. ## Changes - **Removed**: `memoryURL` field, `defaultMemoryURL` const, `ingest()` REST helper, `"io"` import - **Added**: `upsertEntity()` GraphQL mutation helper - **Added**: `fetchEntitySummary()` helper — reads current entity before patch for read-modify-write - **handlePatch**: now fetches current summary, merges patch fields, re-upserts full blob — no data loss on partial updates - **handleCreate / handleCreateMilestone**: `json.Marshal` error now returns 500 instead of silently ignoring - 29 tests pass, 85.4% coverage ## Mutation used ```graphql mutation { upsertEntity(input: { project: "session-<uuid>" name: "<sessionID | milestoneID>" entityType: SESSION | MILESTONE summary: "{...json blob...}" }) { id created } } ``` ## Single upstream All reads and writes now go through `graphqlURL` (poimen-graphql:8090). `MEMORY_UPSTREAM_URL` env var no longer read by this adapter. --------- Co-authored-by: Admin Bot <[email protected]> Reviewed-on: #53