docs(17): capture phase context

.planning/phases/17-object-storage/17-DISCUSSION-LOG.md

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+# Phase 17: Object Storage - Discussion Log
+
+> **Audit trail only.** Do not use as input to planning, research, or execution agents.
+
+**Date:** 2026-04-05
+**Phase:** 17-object-storage
+**Areas discussed:** S3 Client, URL Strategy, Storage Abstraction, Migration Approach
+**Mode:** --auto --batch
+
+---
+
+## S3 Client
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| @aws-sdk/client-s3 | Official AWS SDK v3, S3-compatible, tree-shakeable | ✓ |
+| minio-js | MinIO-specific client | |
+| undici/fetch with S3 API | Raw HTTP calls | |
+
+**User's choice:** @aws-sdk/client-s3 (auto-selected)
+
+---
+
+## URL Strategy
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Presigned URLs | MinIO generates time-limited signed URLs, client fetches directly | ✓ |
+| Proxy through GearBox API | Server fetches from MinIO, streams to client | |
+| Public bucket | No auth needed, direct MinIO URLs | |
+
+**User's choice:** Presigned URLs (auto-selected)
+
+---
+
+## Storage Abstraction
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Thin storage service | Single file wrapping S3 SDK with upload/delete/getUrl | ✓ |
+| Full abstraction layer | Interface with local/S3 implementations | |
+
+**User's choice:** Thin storage service (auto-selected)
+
+---
+
+## Migration Approach
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| One-time script | Reads uploads/, uploads to MinIO, same filenames | ✓ |
+| Lazy migration | Upload to MinIO on first access, fallback to local | |
+
+**User's choice:** One-time script (auto-selected)
+
+---
+
+## Claude's Discretion
+
+- Presigned URL expiry, proxy fallback, MinIO version, bucket policy, cleanup strategy
+
+## Deferred Ideas
+
+None