Measure idle CPU from process CPU-time deltas instead of the lifetime average reported by ps. Expose user and system CPU counters in diagnostics, validate configurable idle and response limits, and fail closed when the server or its protocol pipe exits.
Disable session-CWD auto-indexing inside the explicit-index soak harness so unrelated repository work cannot contend for the pipeline lock, inflate cache/RSS results, or masquerade as idle CPU. Preserve crash/restart coverage and exact cleanup of harness-owned resources.
Validated with the ASan/UBSan MCP suite (171 tests), a bounded 30-second idle soak with crash recovery (0.0% idle CPU, 197 MiB RSS, stable cache/FDs), shell syntax and ShellCheck, source-safety lint, clang-format diff, configuration rejection cases, and diff hygiene.
Signed-off-by: Andrew Hundt <ATHundt@gmail.com>
Andrew Hundt
f21871ee3a