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Use bufio.Writer.AvailableBuffer to write the 32-byte public key directly into bufio's internal buffer as a single append+Write, avoiding 32 separate WriteByte calls. Fall back to the existing byte-at-a-time path when the buffer has insufficient space. ``` name old ns/op new ns/op speedup NodeWriteRawWithoutAllocating-8 121 12.5 ~9.7x (0 allocs/op in both) ``` Add BenchmarkNodeWriteRawWithoutAllocating and expand TestNodeWriteRawWithoutAllocating to cover both fast (AvailableBuffer) and slow (WriteByte fallback) paths with correctness and allocation checks. Updates tailscale/corp#38509 Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>