dangernoodle-io / breadboard / 25903301340

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feat(bb_http_client): portable outbound HTTP GET wrapper (B1-196) (#229)

New component wrapping the outbound HTTP client side that bb_http
intentionally doesn't cover. Public API takes a URL, caller-supplied
body buffer, and optional cfg; returns body + status + truncated flag
via a result struct. Platform impls:

- ESP-IDF: esp_http_client_perform with the cert-bundle / retry /
  backoff pattern proven in bb_ota_pull. Stays under platform/espidf —
  zero esp_* exposure in the public header.
- Host: hermetic mock with bb_http_client_set_mock_response /
  bb_http_client_set_mock_transport_error / bb_http_client_clear_mock
  test hooks. No real network access on host (tests must be hermetic).
- Arduino: BB_ERR_UNSUPPORTED stub. AVR/Cortex-M targets here have
  no general HTTPS client.

Foundation for B1-195 (bb_update_check) and a future B1-198 follow-up
that migrates bb_ota_pull off its direct esp_http_client calls.

11 new host tests, all paths covered.

Resolves B1-196.

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