Function agent_doc_write_ack_content 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn agent_doc_write_ack_content(
    project_root: *const c_char,
    patch_id: *const c_char,
    content: *const c_char,
) -> bool

Write the final applied document content to the ack-content sidecar file.

The binary reads this after receiving IPC ACK to use as snapshot content, eliminating the 200ms sleep + re-read. If the plugin doesn’t call this, the binary falls back to the 200ms sleep heuristic.

Sidecar path: <project_root>/.agent-doc/ack-content/<patch_id>.md

Safety

All three pointers must be valid, NUL-terminated UTF-8 strings.