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feat(node): add task watchdog timer (ND-0919) (#735)

* feat(node): add task watchdog timer (ND-0919)

Add ESP-IDF task watchdog timer to the node firmware to protect
against firmware hangs that would drain the battery indefinitely.

Requirements (ND-0919):
- `CONFIG_ESP_TASK_WDT_EN=y` enables the task watchdog
- `CONFIG_ESP_TASK_WDT_TIMEOUT_S=20` covers worst-case wake cycle
- `CONFIG_ESP_TASK_WDT_PANIC=y` triggers reset on expiry

Changes:
- `node-requirements.md`: add ND-0919 requirement with 4 acceptance
  criteria
- `sdkconfig.defaults`: add watchdog settings after WiFi section
- `node-design.md`: document watchdog in boot sequence (§14 step 2)
- `node-validation.md`: add T-N942 configuration validation test

The modem already has equivalent protection (MD-0302, 35s timeout).
The node's 20s timeout covers WAKE retries (4×600ms ≈ 2.4s) + chunked
transfer + BPF execution + APP_DATA exchanges with margin.

Closes #721

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* feat(node): add runtime task watchdog registration (ND-0919)

Address review: sdkconfig alone doesn't protect the main task.
Add explicit `esp_task_wdt_add()` at startup and
`esp_task_wdt_delete()` after wake cycle completes.

- `node.rs`: register main task with TWDT before platform init,
  deregister after `run_wake_cycle()` returns
- ND-0919 AC4-6: add acceptance criteria for runtime registration
  and deregistration
- `node-design.md`: fix boot sequence numbering (3→11), document
  runtime registration in step 2
- T-N942: add registration/deregistration inspection steps

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

* style(node): cargo fmt

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

---------

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>... (continued)

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