dangernoodle-io / breadboard / 27425639990

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feat(bb_tls_creds): shared mutual-TLS PEM provisioning (#395)

Adds bb_tls_creds component: resolves ca/client_cert/client_key PEM
strings from three-level precedence — programmatic override → NVS
(caller-supplied namespace, keys tls_ca/tls_cert/tls_key) → build-time
embedded weak defaults.  All buffers are heap-owned for the credential's
full lifetime (esp-mqtt/esp-http-client do not copy or free cert
pointers).

Also adds host in-memory string store to the #else (non-ESP_PLATFORM)
block of platform/espidf/bb_nv/bb_nv.c so bb_nv_get_str/bb_nv_set_str
round-trip in Unity host tests.  bb_nv_host_str_store_reset() exposed
under #ifndef ESP_PLATFORM and called from setUp() to prevent
cross-test leakage.

13 Unity tests cover: override beats NVS, NVS used when no override,
partial/absent PEMs, null-out guard, free zeroes + double-free safe,
and independent-copy guarantees.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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