Add MS_SimpleExport bot + hardened Linux export-runner

MS_SimpleExport is a market-data exporter (M1/Tick -> zipped binary), driven
headless via the official cTrader-console Docker image. This adds the bot and a
hardened bash driver that runs the scrape on a Linux host, spawning one ephemeral
console container per backtest window.

- src/MS_SimpleExport: the cBot; csproj aligned to the repo's Linux template
  (AlgoPublish=false, cTrader.Automate 1.*-*).
- scripts/export-runner.sh: hardened port of the Unraid driver -- retry-then-abort
  on transient failure, gap-aware resume, current-month end-date clamp, 3-way run
  classification with a per-run timeout, and ZIP validation before rename.
- scripts/export.env.example: deployment config template (real values live in the
  gitignored runtime/export.env).
- docs/export-runner-quirks.md: the multi-lens audit findings and hardening decisions.
- .gitignore: ignore runtime/ (secrets, the placed .algo, the symbol list).

src/MS_SimpleExport/MS_SimpleExport.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <!-- net6.0 is the runtime cTrader's algo host expects. -->
+    <TargetFramework>net6.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>disable</Nullable>
+    <ImplicitUsings>disable</ImplicitUsings>
+
+    <!--
+      Turn off the cTrader.Automate publish step that copies the .algo into the
+      Windows-only ~/Documents/cAlgo/Sources path. The .algo is still emitted into
+      bin/<config>/<tfm>/; scripts/build.sh collects it into dist/.
+    -->
+    <AlgoPublish>false</AlgoPublish>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- Official Spotware SDK (owner "spotware", not the third-party "cAlgo.API"). -->
+    <PackageReference Include="cTrader.Automate" Version="1.*-*" />
+  </ItemGroup>
+
+</Project>