spec-5.50: CR read-path profile (measure-only harness + TAP) — DRAFT pre-merge CI evidence, do not merge#9

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spec-5.50-cr-profile

Commits on Jun 23, 2026

perf(cluster): spec-5.50 D3 — CR redundancy calc (distinct_cr_keys denominator)
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perf(cluster): spec-5.50 D7 — pg_cluster_state CR counter sampler + delta
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perf(cluster): spec-5.50 D2 — real own-instance CR read-path profile TAP
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perf(cluster): spec-5.50 D1 — CR read-path 3-axis profile harness
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ci(perf): spec-5.50 D8 — wire CR read-path profile into perf workflow
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perf(cluster): spec-5.50 — renumber CR profile TAP 291 -> 300 (avoid 5.8 collision)
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style(cluster): spec-5.50 — add Author header to t/300 (rule 11 gate)
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