docs: record source-fresh performance boundary

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Kinneyzhang 2026-08-20 07:44:25 +08:00
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`task030` remain open.
- **Commit:** `6a8c7e0`.
## 2026-08-20 — Record source-fresh performance boundary
- **Add** `postmortem/20260820-source-fresh-live-commit-gate.md` to explain
why the stale-bytecode evaluator result was invalid and why the corrected
source gate remains an open `task030` performance target.
- **Evidence:** width-80/two-row/GC-excluded source candidate p95/p99 are
23.294 ms (C) and 78.593 ms (Elisp), with parity, zero-work, GC,
conflict, and non-regression checks true. The high-row full matrix was
stopped after a source DP cell exceeded two minutes of CPU; it is not
claimed as complete evidence.
- **Commit:** Pending documentation commit.
## Verification
- Source-first normal ERT: 295/295.