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Every other test in this crate drives `fake-mcp`, which answers whatever the
test tells it to. That proves our plumbing, not that it matches the server buzz
actually ships. These two drive the real binary: real tool names, real schemas,
real in-process todo state, real _Stop/_PostCompact semantics.
real_dev_mcp_stop_hook_blocks_end_of_turn scripts the exact scenario the veto
exists for -- the model records an open todo item via the real `todo` tool, then
tries to stop. Asserts the turn is extended and that buzz-dev-mcp's own
objection text ("open todo items") reaches the model.
real_dev_mcp_advertises_its_tools pins the shipped tool surface (shell,
read_file, str_replace, todo) and locks in the KNOWN DEVIATION: _Stop stays
visible to the model, with system-prompt guidance not to call it.
Both skip cleanly if buzz-dev-mcp isn't built.
25 tests green, fmt + clippy -D warnings clean.
Signed-off-by: Michael Neale <michael.neale@gmail.com>