feat: add learner memory ingestion

.planning/phases/003-learner-memory/003-VERIFICATION.md

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+# Phase 3 Verification
+
+## Verdict
+
+PASS
+
+## Requirement Coverage
+
+- MEM-01: PASS. Diagnostic session creation ensures a learner profile with
+  target role, stack, and timeline.
+- MEM-02: PASS. Graded answer evidence creates concept mastery entries.
+- MEM-03: PASS. Weak or partial answers create evidenced misconception entries.
+- MEM-04: PASS. Weak or partial answers create intervention history and review
+  schedule entries.
+- MEM-05: PASS. Memory service ignores update candidates without evidence.
+
+## Evidence
+
+- `go test ./...` passed.
+- `openspec validate bootstrap-job-tutor-platform --strict` passed.
+- Live diagnostic create/answer plus learner memory read smoke passed.
+- Go source line-count check passed.
+
+## Residual Risk
+
+Learner memory is intentionally in-memory for the MVP proof. Data is lost on
+process restart until a persistence phase is planned.