fix(minio): support mc_path and harden sync against transient objects

docs/plans/state.json

@@ -5860,10 +5860,43 @@
         "docs/plans/state.json"
       ],
       "test_status": "docs-only change"
+    },
+    "minio-mc-path-and-enoent-hardening": {
+      "status": "completed",
+      "date": "2026-02-19",
+      "updated": "2026-02-19",
+      "summary": "Added backup-level MinIO CLI path override (`backup.minio.mc_path`) and wired it through MinIO backup upload + `minio.share`/`minio.ingest`/`minio.sync`. Added consistent ENOENT guidance so missing `mc` now returns actionable setup errors instead of raw spawn failures.",
+      "files_modified": [
+        "src/config/schema.ts",
+        "src/config/schema.test.ts",
+        "src/backup/run.ts",
+        "src/backup/run.test.ts",
+        "src/tools/builtin/minio-share.ts",
+        "src/tools/builtin/minio-share.test.ts",
+        "src/tools/builtin/minio-ingest.ts",
+        "src/tools/builtin/minio-ingest.test.ts",
+        "src/tools/builtin/minio-sync.ts",
+        "src/tools/builtin/minio-sync.test.ts",
+        "README.md",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/config/schema.test.ts src/tools/builtin/minio-sync.test.ts src/tools/builtin/minio-ingest.test.ts src/tools/builtin/minio-share.test.ts src/backup/run.test.ts + pnpm typecheck passing"
+    },
+    "minio-sync-keep-marker-and-race-hardening": {
+      "status": "completed",
+      "date": "2026-02-19",
+      "updated": "2026-02-19",
+      "summary": "Hardened `minio.sync` against noisy object listings and race conditions by skipping `.keep` marker objects and treating missing-object read errors (objects deleted after listing) as per-object skips instead of failing the entire sync task.",
+      "files_modified": [
+        "src/tools/builtin/minio-sync.ts",
+        "src/tools/builtin/minio-sync.test.ts",
+        "docs/plans/state.json"
+      ],
+      "test_status": "pnpm test:run src/tools/builtin/minio-sync.test.ts + pnpm typecheck passing"
     }
   },
   "overall_progress": {
-    "total_test_count": 1933,
+    "total_test_count": 1941,
     "all_tests_passing": true,
     "p0_completion": "3/3 (100%)",
     "p1_completion": "4/4 (100%)",