wave 7: fuzz sidecar scaffold (fuzz/ workspace, shared crate, runner, dict, seeds skeleton)

fuzz/fuzz_targets/placeholder.rs

@@ -0,0 +1,11 @@
+//! Placeholder target: the scaffold carries no real targets yet. The
+//! wave-1 target tasks (payload_codec, every_parse, name_validation)
+//! replace this with their fuzz_targets entries; it exists only so the
+//! bins-only sidecar manifest parses and `cargo fuzz build` exercises
+//! the nightly + ASAN toolchain check from wave 7 onward.
+
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|_data: &[u8]| {});