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a9a943b858
Add _to() variants that write into a stack buffer and return StringRef, avoiding heap allocation on every publish. Update publish_state() in climate (11 allocations eliminated), fan (3), cover (2), and valve (1) to use the new stack-based getters. The allocating getters are retained for setup-time paths (subscribe, send_discovery, dump_config) where the allocation is one-time.
