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feat: runtime WiFi reconfigure with safe rollback (PATCH /api/wifi) (#351)

* feat: add pure bb_nv wifi-pending decide/validate helper + host tests

- bb_wifi_pending_decide(): pure flag+ssid guard; no esp, no heap, no globals
- bb_wifi_pending_validate(): enforces SSID_MAX=31 / PASS_MAX=63 before staging
- wired into bb_nv CMakeLists.txt SRCS and native_scaffold.py source map
- 12 host tests covering all decide/validate branches; 100% line+branch coverage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat: bb_nv pending wifi creds slot (stage/commit/revert)

- add set/active/ssid/pass/commit/clear_wifi_pending to bb_nv
- pending creds live in s_pending (separate from s_config); live creds
  and the rtc mirror are mutated only by commit_wifi_pending
- nvs keys: wifi_ssid_p, wifi_pass_p, wifi_try (all in bb_cfg namespace)
- pending cache loaded at init time without touching the ssid[0]=='\0'
  rtc-restore gate
- all new esp logic guarded #ifdef ESP_PLATFORM; host stubs inline in
  bb_nv.h returning BB_ERR_UNSUPPORTED / false / ""

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat: bb_wifi bounded pending-creds try + commit/revert + bb_wifi_reconfigure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat: PATCH /api/wifi runtime reconfigure route

- adds PATCH /api/wifi {ssid, password} handler in bb_wifi_routes.c,
  gated on CONFIG_BB_WIFI_RECONFIGURE (default y)
- valid body → 202 {"status":"rebooting_to_try_wifi"} + bb_wifi_reconfigure
  (arms ~500ms deferred restart so 202 flushes before reboot)
- invalid body / bad credentials → 400 {"error":"..."}
- route descriptor with 202/400 response schemas registered alongside GET
- bb_http_reserve_routes bumps 2→3 when CONFIG_BB_WIFI_RECONFIGURE=y
- fidelity tests for 202 and 400 response shapes added; make test: 1241 passed
- coverage maintained at 100%

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <nor... (continued)

1418 of 1418 branches covered (100.0%)

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