Document shared evidence schema

SCHEMA.md

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+# Evidence schema (v1)
+
+This repo is coordinated across parallel sessions. Each session writes its own evidence under:
+
+- `data/ho36/`
+- `data/flaneur/`
+
+## `evidence.json`
+
+Top-level:
+
+```json
+{
+  "hostel_name": "string",
+  "collected_at": "ISO datetime",
+  "collector_session": "A|B|C",
+  "evidence": [],
+  "profile": {}
+}
+```
+
+Each evidence item (one “fact”) is a row/object with:
+
+- `target`: `"ho36"` | `"flaneur"`
+- `source`: `"official_site"` | `"google_maps"` | `"booking"` | `"hostelworld"` | `"tripadvisor"` | `"instagram"` | `"facebook"` | `"tiktok"` | `"press"` | `"other"`
+- `metric_name`: string
+- `metric_value`: string | number | null
+- `url`: string
+- `captured_at`: ISO datetime
+- `status`: `"ok"` | `"blocked"` | `"unknown"` | `"error"`
+- `confidence`: `"high"` | `"med"` | `"low"`
+- `notes`: string
+- `screenshot_path`: string | null
+
+## `evidence.csv`
+
+One row per evidence item, with the same fields:
+
+`target,source,metric_name,metric_value,url,captured_at,status,confidence,notes,screenshot_path`
+