review(회차1): nit 3건 반영

- §10 long-running 절 끝 빈 줄 3 → 1 (다른 절 사이 일관)
- wire schema + §2.4a 예제 JSON: kind_result → result (top-level
  kind 와의 모호성 제거; ingest_report.v1.items[].kind 와 짝)
- wire schema 의 ts 필드: format: \"date-time\" 추가 (RFC 3339
  자동 검증, wrapper 가 다른 format emit 시 즉시 잡힘)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/wire-schema/v1/ingest_progress.schema.json

@@ -20,13 +20,13 @@
         "aborted"
       ]
     },
-    "ts":           { "type": "string", "description": "RFC 3339 timestamp at the moment the event was emitted." },
+    "ts":           { "type": "string", "format": "date-time", "description": "RFC 3339 timestamp at the moment the event was emitted." },
     "root":         { "type": "string", "description": "scan_started: workspace root being walked." },
     "total":        { "type": "integer", "minimum": 0, "description": "scan_completed / asset_started / asset_finished: total assets discovered." },
     "idx":          { "type": "integer", "minimum": 1, "description": "asset_started / asset_finished: 1-based index of the current asset within the scan." },
     "path":         { "type": "string", "description": "asset_started: workspace-relative path of the asset being processed." },
     "media":        { "type": "string", "description": "asset_started: media kind label (e.g. `markdown`, `pdf`, `image`)." },
-    "kind_result":  {
+    "result":       {
       "type": "string",
       "enum": ["new", "updated", "skipped", "error"],
       "description": "asset_finished: per-asset outcome (mirrors `ingest_report.v1.items[].kind`)."