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refactor: extract mqtt_acquire_client B1-296 guard; share between publish/subscribe (B1-340) (#510)

publish and subscribe had a byte-identical take-lock / check-destroyed / capture-
client-before-unlock block. Extract it to a static inline mqtt_acquire_client that
preserves the exact invariant (client captured under the lock before release). The
event-handler early-exit (checks destroyed only, no client capture) is left as-is —
different semantics. ESP-IDF-only file; CI espidf build is the validator.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Claude-Session: https://claude.ai/code/session_01Ly8KysyxqixYGEbgtabjMN

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