feat: Child process RAM tracking and JSON output#3
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Two opt-in, dependency-free capabilities for benchmark consumers:
- rss_sampler: a background thread summing VmRSS across this process and
all descendants, tracking the peak. Captures memory resident in child
processes (e.g. zkVM ASM microservices in separate PIDs) that a bare
/proc/self/status read of the parent misses. Public start() /
peak_tree_rss_bytes() / reset_peak_tree_rss().
- json_sink: a JSON-Lines sink writing {"span","seconds"} per closed
examined span, plus record_manual for span-free phase timings, so a
harness can aggregate per-phase timings without scraping the timeline.
Linux-only for RSS; no new dependencies. Tests cover the child-process
peak and the span-timing record.
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