content: 忽略时间戳误差的 MCRB 下界

估计器假设同步、真值含 δ_ℓ → MCRB（Huber sandwich A^{-1}BA^{-1}+偏置外积）给下界；时间戳节增 MCRB 小节，附录增 F.5 推导，ref.bib 补 richmondParameterBounds2015。
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 }

+@article{richmondParameterBoundsEstimation2015,
+  title = {Parameter {{Bounds}} on {{Estimation Accuracy Under Model Misspecification}}},
+  author = {Richmond, Christ D. and Horowitz, Larry L.},
+  date = {2015-05},
+  journaltitle = {IEEE Transactions on Signal Processing},
+  volume = {63},
+  number = {9},
+  pages = {2263--2278},
+  doi = {10.1109/TSP.2015.2411222}
+}
+
@article{stoicaMusicMaximumLikelihood1989,
  title = {Music, {{Maximum Likelihood}}, and {{Cramér-Rao Bound}}},
  author = {Stoica, Petre and Nehorai, Arye},