PerfTrace core: span API, ring buffer, tag allowlist (CL-5160) - #303
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Always-on in-process span API (start/end/mark) using monotonic hrtime, a fixed 4096-span ring, and privacy-sanitized tags. No network or PostHog; snapshot/clear for tests.
Accept parentId only as opaque span ids (known open/ring or OPAQUE_ID_RE); return shallow snapshot copies; cap open spans with oldest-first eviction; mark() takes StartOptions; cover double-end, clear, and overflow paths.
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Stack
PerfTrace stack 1/8 — base of the always-on performance tracing series.
stack/w1a-cl-5160-perftrace-corestack/w2a-cl-5171-auto-spansstack/w2b-cl-5175-otel-settingsstack/w3a-cl-5169-dump-rollupstack/w3b-cl-5170-perm-subagentstack/w4a-cl-5173-otel-sinkstack/w4b-cl-5174-eval-harnessstack/w5-cl-5167-attributionLinear
https://linear.app/abklabs/issue/CL-5160/perftrace-core-span-api-ring-buffer-and-local-tag-allowlist
Summary
Local PerfTrace core: start/end/mark span API, fixed-size ring buffer, privacy-strict tag allowlist. No network, no OTEL yet.
Test evidence
Merge note
Do not merge out of order. Merge this first; then stack dependents.