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docs(r07): Part 8 — Debugging - #7
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bugfarm corpus (crash/core/gdb backtrace; leak/uaf/uninit/overflow/race under valgrind/ASan/TSan; Rust prevents four at compile time, exits 64); eBPF observation toolkit on systems-target (bcc/bpftrace/bpftool uprobing our own binaries); per-language profiling toolbelts (perf/flamegraph, pprof/trace/delve, cargo-flamegraph/clippy). 8 diagram pairs. Sonnet authoring + Opus scoped validator: all tool transcripts re-run and matched (gdb frames, valgrind/ASan/TSan signatures, perf stat). 90/90.
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Chapters 28-31 + 4 examples. bugfarm seeded-bug corpus (each defect genuinely triggers its detector; Rust's prevented cases exit 64), eBPF observation toolkit run live on systems-target (uprobes on our own binaries — tooling, not kernel eBPF), per-language profiling toolbelts. 90/90 matrix PASS incl. VM lane 30. First iteration on the reduced-cost recipe (Sonnet authoring, Opus scoped validator, gate run in main loop) — quality held: validator re-ran real gdb/valgrind/ASan/TSan/perf and all signatures matched.