The real-Hopper navigation probe derived its interior coordinate as
anchor + 1, which assumes the fixture procedure's first instruction is
longer than one byte. Host toolchains without endbr64-style prologue
padding (Kali gcc 16, or any build with -fcf-protection=none) compile
rea_entry to start with the one-byte push rbp, so anchor + 1 is itself
an instruction boundary: goto_address correctly observes that boundary
and the boundary-contract run rejects a correct bridge.
Advance the probe to the first instruction followed by a coordinate gap
larger than one byte and derive the interior-coordinate assertions from
that instruction, so the probed coordinate is never an analyzed-object
boundary on either prologue encoding.
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