docs: record SSH operations and daytime call evidence

docs/evidence/real-cell-call-20260915-daylight.json

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+{
+  "schema_version": "1.0",
+  "status": "FAIL",
+  "mode": "real",
+  "authorization": {
+    "scope": "one controlled daytime real outbound call",
+    "callee": "15003164745",
+    "max_rounds": 3,
+    "automatic_retry": false
+  },
+  "execution": {
+    "execution_id": "exec_cell_1789434620898180840_10",
+    "call_id": "call_63d20cfd035346f2acab068d51bbce07",
+    "event_id": "exec_cell_1789434620898180840_10:call.finished",
+    "tenant_id": "tenant-demo",
+    "tenant_key": "tenant-demo-key",
+    "connected": false,
+    "duration_ms": 881.5649320022203,
+    "reason_code": "CALL_NOT_ANSWERED",
+    "turns": 0,
+    "media_packets_in": 0,
+    "media_packets_out": 0
+  },
+  "sip": {
+    "codec": "PCMA/8000",
+    "responses": ["100 trying", "183 Session Progress", "486 Busy Here"],
+    "reason": "Q.850 cause=16 NORMAL_CLEARING",
+    "external_media": "UnicastRTP channel created and joined the bridge",
+    "rtp_and_recording": "no answered media session"
+  },
+  "acceptance": {
+    "real_sip_connected": false,
+    "bidirectional_rtp_verified": false,
+    "real_asr_llm_tts_turns": false,
+    "three_round_conversation": false,
+    "human_listening": false,
+    "oss_recording_handoff": false
+  },
+  "note": "This daytime attempt did not reach SIP 200 OK. The provider returned 486 Busy Here after 183 Session Progress; this is consistent with a busy/unavailable destination but does not by itself prove a time-window restriction. No automatic retry was issued. Credentials, provider URLs, SIP addresses, and API keys are omitted."
+}