v3 M1a: provider framework — config v2 + Provider abstraction (daemon)

Introduce the multi-provider seam on the host, behaviour-identical for Anthropic.

- config v2: `providers` (per-provider enable + creds), `active_provider`,
  `display_order`; v1 configs migrate transparently (anthropic enabled+active).
  New accessors: active_provider_id / provider_conf / enabled_providers.
- daemon/providers/: Provider ABC + normalized ProviderStatus (maps to the same
  s/sr/w/wr/st/tk/to/tc/tn BLE fields), AnthropicProvider (wraps the existing
  OAuth+poll+local-usage logic), StubProvider for openai/zai until M2/M3, and a
  get_provider() registry.
- poll loop: polls the config-selected active provider each cycle and tags the
  payload with `pv` (the brand-theme id the watch will wear). Watch->PC
  `{"cmd":"prov","id":".."}` persists the active provider and repolls at once.
- clawdmeter.spec: bundle daemon.providers for the frozen exe.
- test: 7 new provider/config tests; fix a stale start_notify count assertion
  (the M2 command channel means both REQ and CMD subscriptions are attempted).

Verified live: config loads as v2, active provider resolves to AnthropicProvider,
a real poll returns ok=True (s=53%, w=5%); full suite 87 passed (+7 new).

daemon/tests/test_windows_reconnect.py

@@ -599,8 +599,10 @@ def test_start_notify_oserror_does_not_crash_connect_and_run():
         # Must NOT raise OSError — graceful degradation into the poll loop.
         result = _run(connect_and_run(device, stop_event))
 
-    # start_notify was actually attempted (and raised), but was swallowed.
-    assert mock_client.start_notify.call_count == 1
+    # start_notify was actually attempted (and raised), but was swallowed — for
+    # BOTH subscriptions the daemon sets up: the REQ refresh channel and the CMD
+    # command channel (battery + HA). Both degrade gracefully.
+    assert mock_client.start_notify.call_count == 2
     # Function returned normally instead of propagating the OSError.
     assert result is False
     # The link was cleaned up via the finally block.