docs(ApiReference): document logs.list/logs.download and extended firmware.status

Mirrors firmware changes: new SD log retrieval commands on LoggingHandler
(logs.list, logs.download — chunked/paginated for offline-device
troubleshooting), and firmware.status now returns OTA rollback safety-net
diagnostics (retry/failure counts, backup partition info).

frontend/src/pages/engineering/developer/ApiReferencePage.jsx

@@ -677,9 +677,9 @@ const NAMESPACES = [
         cmd: 'firmware.status',
         handler: 'FirmwareHandler',
         transports: ['All'],
-        description: 'Get firmware validation state, version, boot count, and commit/rollback eligibility.',
+        description: 'Get firmware validation state, version, boot count, rollback safety-net diagnostics, and commit/rollback eligibility.',
         contents: null,
-        response: '{\n  "status": "SUCCESS",\n  "type": "firmware.status",\n  "data": {\n    "validation_state": "VALIDATED",\n    "current_version": "143",\n    "is_testing": false,\n    "is_valid": true,\n    "boot_count": 12,\n    "build_date": "2026-07-10",\n    "ota_channel": "stable",\n    "can_commit": false,\n    "can_rollback": false\n  }\n}',
+        response: '{\n  "status": "SUCCESS",\n  "type": "firmware.status",\n  "data": {\n    "validation_state": "VALIDATED",\n    "current_version": "143",\n    "is_testing": false,\n    "is_valid": true,\n    "boot_count": 12,\n    "build_date": "2026-07-10",\n    "ota_channel": "stable",\n    "startup_retry_count": 0,\n    "max_startup_retries": 3,\n    "runtime_failure_count": 0,\n    "max_runtime_failures": 5,\n    "backup_version": "142",\n    "backup_is_valid": true,\n    "can_commit": false,\n    "can_rollback": false\n  }\n}',
         errors: [],
         example: '{ "v": 2, "cmd": "firmware.status" }',
         warning: null,
@@ -951,6 +951,37 @@ const NAMESPACES = [
         example: '{ "v": 2, "cmd": "log.get_config" }',
         warning: null,
       },
+      {
+        cmd: 'logs.list',
+        handler: 'LoggingHandler',
+        transports: ['All'],
+        description: 'List day-rotated SD log files (/logs/YYYY-MM-DD.log) with size. Requires an SD card.',
+        contents: null,
+        response: '{\n  "status": "SUCCESS",\n  "type": "logs.list",\n  "data": {\n    "files": [\n      { "name": "2026-07-13.log", "size": 48213 },\n      { "name": "2026-07-14.log", "size": 9120 }\n    ]\n  }\n}',
+        errors: [
+          { message: 'SD card not available on this device', condition: 'Device has no SD card, or FileManager was not wired up' },
+        ],
+        example: '{ "v": 2, "cmd": "logs.list" }',
+        warning: null,
+      },
+      {
+        cmd: 'logs.download',
+        handler: 'LoggingHandler',
+        transports: ['All'],
+        description: 'Read a bounded chunk (max 4096 bytes) of a log file for offline-device troubleshooting. Loop with the returned next_offset until eof is true.',
+        contents: [
+          { field: 'file', type: 'string', required: true, notes: 'Bare filename as returned by logs.list — no path separators' },
+          { field: 'offset', type: 'int', required: false, notes: 'Byte offset to resume from. Default 0.' },
+        ],
+        response: '{\n  "status": "SUCCESS",\n  "type": "logs.download",\n  "data": {\n    "file": "2026-07-14.log",\n    "data": "[INFO][BellEngine] Ring scheduled (12345ms)\\n",\n    "next_offset": 4096,\n    "eof": false\n  }\n}',
+        errors: [
+          { message: 'SD card not available on this device', condition: 'Device has no SD card, or FileManager was not wired up' },
+          { message: 'Missing required field: file', condition: 'contents.file is absent' },
+          { message: 'Log file not found: <file>', condition: 'File does not exist, or file contains a path separator / ".." (rejected)' },
+        ],
+        example: '{ "v": 2, "cmd": "logs.download", "contents": { "file": "2026-07-14.log", "offset": 0 } }',
+        warning: 'Loop by feeding the previous response\'s next_offset back in as offset until eof is true — a single call never returns a whole large file.',
+      },
     ],
   },
   {