feat: add learner memory ingestion

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

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+# Phase 3: Learner Memory - Context
+
+**Gathered:** 2026-04-26
+**Status:** Ready for planning
+**Source:** GSD continuation after Phase 2 completion
+
+<domain>
+## Phase Boundary
+
+Phase 3 converts graded answer evidence into structured learner memory. It
+should build the memory boundary needed by later progression work while keeping
+storage in-memory for now.
+
+</domain>
+
+<decisions>
+## Implementation Decisions
+
+### Persistence
+
+- Use in-memory learner memory storage in Phase 3.
+- Do not introduce a database until the product loop needs durability across
+  restarts.
+- Preserve a clear store interface so persistent storage can replace it later.
+
+### Memory Model
+
+- Store learner profile.
+- Store concept mastery with evidence.
+- Store misconception records linked to answer evidence.
+- Store intervention history and review schedule placeholders.
+- Do not promote temporary session context unless workflow output includes
+  evidence.
+
+### Integration
+
+- Diagnostic answer submission should invoke memory extraction after typed
+  grading.
+- The workflow runner should emit `MemoryUpdateCandidate` values.
+- Memory service should apply only updates with evidence.
+
+</decisions>
+
+<canonical_refs>
+## Canonical References
+
+- `docs/planning/PRD.md` - learner memory product goals.
+- `docs/planning/ARCHITECTURE.md` - memory strategy.
+- `docs/planning/WORKFLOW_CONTRACTS.md` - memory update contract.
+- `.planning/REQUIREMENTS.md` - MEM-01 through MEM-05.
+- `.planning/ROADMAP.md` - Phase 3 success criteria.
+- `openspec/changes/bootstrap-job-tutor-platform/specs/learner-memory/spec.md`
+  - learner memory requirements.
+
+</canonical_refs>
+
+<specifics>
+## Specific Ideas
+
+- Add `internal/learnermemory`.
+- Add `GET /api/v1/learners/{userID}/memory`.
+- Wire diagnostic answer submission to memory ingestion.
+- Keep memory extraction deterministic in the workflow stub.
+
+</specifics>
+
+<deferred>
+## Deferred Ideas
+
+- Database persistence.
+- Cross-session ranking/decay.
+- UI readiness map.
+- Spaced repetition scheduling details.
+
+</deferred>
+
+---
+*Phase: 003-learner-memory*
+*Context gathered: 2026-04-26*