feat: add ontology material ingestion

.planning/phases/005-ontology-materials/005-SUMMARY.md

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+# Phase 5 Summary
+
+**Status:** Complete
+**Completed:** 2026-04-26
+
+## Delivered
+
+- Added `internal/ontology` for materials, concept candidates, edge candidates,
+  gaps, and snapshots.
+- Added deterministic MVP analyzer for known backend interview concepts.
+- Added source evidence to every supported concept and edge candidate.
+- Added candidate-only gap records for missing prerequisites and weak evidence.
+- Added HTTP endpoints:
+  - `POST /api/v1/materials`
+  - `GET /api/v1/ontology`
+- Added ontology unit tests and HTTP flow tests.
+
+## Verification
+
+```powershell
+gofmt -w cmd internal
+go test ./...
+openspec validate bootstrap-job-tutor-platform --strict
+```
+
+Additional smoke check:
+
+- Material ingestion followed by ontology snapshot returned candidate concepts,
+  edges, and gaps.
+
+## Deferred
+
+- Multipart uploads.
+- PPT/PDF/document parsing.
+- Human review and canonical promotion.
+- Graph database persistence.