Add remaining read-only physical coverage

[MarcLeinenDE]

Add a dedicated physical SDK suite for seven existing read-only helpers that were still missing persisted physical coverage in the canonical API↔SDK audit.

Covered without logging sensitive values:

• router/get_mac_info
• statistics/get_login_client_mac
• version/get_magicnumber
• wireless/get_diag_wifi_info
• wireless/get_extender_config
• wireless/wifi_get_timed_off_status
• sms/sms.query

API-first check:

• all seven contracts are already LIVE_VERIFIED, ADMIN_OK and READ_OR_LOW_SIDE_EFFECT on current nr2301-api/main
• no upstream contract change is required before this SDK test branch
• any new physical mismatch found by the run will be normalized in nr2301-api first before this PR is merged

Privacy:

• no MAC values, SSIDs, extender keys, magic value or SMS IDs are printed
• SMS query logs only resp or count, never IDs

Keep draft until the physical router run completes.

Physical run (2026-09-25):

• 7/7 tests passed in 0.86s
• router/get_mac_info: PASS without logging identifiers
• statistics/get_login_client_mac: PASS without logging identifier
• version/get_magicnumber: PASS without logging raw value
• wireless/get_diag_wifi_info: PASS
• wireless/get_extender_config: PASS without logging SSID/key values
• wireless/wifi_get_timed_off_status: PASS
• sms/sms.query: PASS through endpoint-specific semantic non-success handling with resp=-2; no SMS IDs logged
• canonical API evidence/audit was updated first in nr2301-api PR Add remaining read-only physical coverage #34, merged as 38c7331a54dcdfb4739108f6cd439b391e5ecf92
• API validator #216: SUCCESS

This closes all seven read-only existing-helper gaps targeted by this PR.