feat(wctt): per-stream sensitivity output (v0.9.2)#196
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…0.9.2) Reviewer NC top-5 #13 — pure post-processing on closed-form derivatives, no new bounds math. After each `WcttBound` Info diagnostic, emit a `WcttSensitivity` Info diagnostic carrying worst-hop partial derivatives at the operating point: ∂WCTT/∂σ_self = 8e12 / min(R_residual) (ps per byte; worst hop dominates the chain) ∂WCTT/∂ρ_competing = σ_total / (R - ρ_c)² (ps per bps, worst hop) ∂WCTT/∂T_link = hops_counted (chain rule across passthrough) For the architect: "if I add 1 frame to this stream, does the bound shift by 1 µs or 100 µs?" answered instantly without re-running spar. Turns spar from judge into design partner. REQ-NETWORK-012 + TEST-WCTT-SENSITIVITY. Existing fixture classical_ethernet.expected.json updated to include the new diagnostic. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Honesty + tightness pass. Closes 6 reviewer items + Lean spec align + org-wide CI concurrency control: - α(0)=0 causality fix (#193) — discharges 5/5 → 4 sorrys in MinPlus - Spar_TSN::Hi/Lo_Credit user-tunable CBS (#195) — Tier A #8 - WCTT sensitivity output (#196) — NC top-5 #13 - Stop_For_Lock + ARINC severity (#197) — Tier A #6 + #9 - Context_Switch in RTA recurrence (#198) — Tier A #5 (partial) - RTA→WCTT release-jitter coupling (#199) — NC top-5 #4 - Nightly fuzz + bench workflow fixes (#194) - Org-wide CI concurrency control (#200) Workspace version 0.9.1 → 0.9.2. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Reviewer NC top-5 #13. After each WcttBound, emit WcttSensitivity with worst-hop partials: ∂σ_self, ∂ρ_competing, ∂T_link. Pure post-processing on closed-form derivatives.
Test plan: 2782/2782 tests pass; clippy/fmt/rivet clean; golden fixture updated.
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