feat: Add comprehensive testing plan for IPSExtractor, including unit, integration, E2E, stress, and resilience tests. Introduce LaTeX documentation structure with sections for architecture, test strategy, and execution guidelines. Enhance README with setup instructions and k6 stress testing scripts.

docs/plan_pruebas/diagrams/flujo_bot.tex

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+\begin{figure}[ht]
+\centering
+\begin{tikzpicture}[
+  font=\footnotesize,
+  actor/.style={draw=ipsblue, rounded corners=2pt, align=center, minimum width=1.7cm, minimum height=0.7cm, fill=codebg},
+  msg/.style={-{Latex}, thick},
+  note/.style={align=left, font=\scriptsize\color{ipsgrey}}
+]
+  \node[actor] (d) {Desktop};
+  \node[actor, right=1.5cm of d] (g) {Gateway};
+  \node[actor, right=1.5cm of g] (a) {API bot};
+  \node[actor, right=1.5cm of a] (w) {Agent};
+  \node[actor, right=1.5cm of w] (m) {MinIO};
+
+  \coordinate (top) at ($(d.south)+(0,-0.35)$);
+  \foreach \n in {d,g,a,w,m} {
+    \draw[ipsgrey!60] (\n.south) -- ++(0,-5.6);
+  }
+
+  \draw[msg] ($(w.south)+(0,-0.5)$) -- node[above,font=\scriptsize]{register + heartbeat} ($(a.south)+(0,-0.5)$);
+  \draw[msg] ($(d.south)+(0,-1.3)$) -- node[above,font=\scriptsize]{POST /jobs (Excel)} ($(a.south)+(0,-1.3)$);
+  \draw[msg] ($(a.south)+(0,-2.0)$) -- node[above,font=\scriptsize]{PutObject Excel} ($(m.south)+(0,-2.0)$);
+  \draw[msg] ($(w.south)+(0,-2.7)$) -- node[above,font=\scriptsize]{claim\_pending} ($(a.south)+(0,-2.7)$);
+  \draw[msg] ($(w.south)+(0,-3.4)$) -- node[above,font=\scriptsize]{GET Excel / Put PDFs} ($(m.south)+(0,-3.4)$);
+  \draw[msg] ($(w.south)+(0,-4.1)$) -- node[above,font=\scriptsize]{POST events} ($(a.south)+(0,-4.1)$);
+  \draw[msg] ($(w.south)+(0,-4.8)$) -- node[above,font=\scriptsize]{PATCH completed} ($(a.south)+(0,-4.8)$);
+  \draw[msg] ($(d.south)+(0,-5.4)$) -- node[above,font=\scriptsize]{poll job + files} ($(a.south)+(0,-5.4)$);
+\end{tikzpicture}
+\caption{Secuencia del flujo bot de descarga.}
+\label{fig:flujo-bot}
+\end{figure}