fix(cli): forward stdin for interactive scripts in run mode

Scripts using vix::io (or any stdin-reading API) were not receiving
keyboard input because passthroughRuntime was set to false whenever
useVixRuntime was true.

- RunScript.cpp: pass passthroughRuntime=true unless --force-server
- DirectScriptRunner.cpp: same fix in make_direct_script_plan
- ScriptProbe.cpp: exclude vix/* headers from include_path_requires_fallback
  to avoid redundant fallback path when usesVix already covers it

Author: GaspardKirira

src/commands/run/RunScript.cpp

@@ -624,15 +624,20 @@ namespace vix::commands::RunCommand::detail
     {
       apply_sanitizer_env_if_needed(opt.enableSanitizers, opt.enableUbsanOnly);
 
-      const bool isPlainScript = !state.useVixRuntime;
+      // A script using vix::io (stdin/stdout) needs stdin forwarded just like
+      // a plain script. Only true long-lived server apps should suppress passthrough.
+      // Use forceServerLike to distinguish: if the user didn't explicitly say
+      // --force-server, treat any non-watch script as interactive (passthrough).
+      const bool isInteractive = !opt.forceServerLike || !state.useVixRuntime;
+
       std::string cmdRun = "VIX_STDOUT_MODE=line " + quote(state.exePath.string());
       cmdRun += join_quoted_args_local(opt.runArgs);
       cmdRun = wrap_with_cwd_if_needed(opt, cmdRun);
 
       LiveRunResult rr = run_cmd_live_filtered_capture(
           cmdRun,
           "",
-          isPlainScript,
+          isInteractive, // ← corrigé
           effective_timeout_sec(opt),
           opt.enableSanitizers || opt.enableUbsanOnly);
 

src/commands/run/detail/DirectScriptRunner.cpp

@@ -399,7 +399,7 @@ namespace vix::commands::RunCommand::detail
     plan.binaryPath = plan.cacheDir / (plan.exeName + executable_suffix());
 
     plan.shouldRun = true;
-    plan.passthroughRuntime = opt.forceServerLike || opt.watch;
+    plan.passthroughRuntime = !opt.forceServerLike;
     plan.effectiveTimeoutSec = effective_timeout_sec(opt);
     plan.probe = probe;
 

src/commands/run/detail/ScriptProbe.cpp

@@ -99,30 +99,6 @@ namespace vix::commands::RunCommand::detail
       return std::nullopt;
     }
 
-    /**
-     * @brief Return true when the include clearly looks project-managed.
-     *
-     * Direct script mode is intentionally strict:
-     * - quoted includes are treated as project headers
-     * - includes containing a path separator are treated as project layout
-     */
-    bool include_path_requires_fallback(const std::string &includePath, bool isQuotedInclude)
-    {
-      if (includePath.empty())
-        return false;
-
-      if (isQuotedInclude)
-        return true;
-
-      if (includePath.find('/') != std::string::npos ||
-          includePath.find('\\') != std::string::npos)
-      {
-        return true;
-      }
-
-      return false;
-    }
-
     /**
      * @brief Return true when the include path is a Vix runtime header.
      *
@@ -147,6 +123,36 @@ namespace vix::commands::RunCommand::detail
       return starts_with(includePath, "vix/");
     }
 
+    /**
+     * @brief Return true when the include clearly looks project-managed.
+     *
+     * Vix runtime headers (<vix/...>) are excluded from this check:
+     * they are handled separately via is_vix_runtime_include() and
+     * already force CMake fallback through usesVix → requiresCMakeTargets.
+     * Treating them as "project layout" here would cause script_source_requires_cmake_fallback
+     * to fire redundantly AND prevent the correct fallback reason from being set.
+     */
+    bool include_path_requires_fallback(const std::string &includePath, bool isQuotedInclude)
+    {
+      if (includePath.empty())
+        return false;
+
+      // Vix runtime headers are handled by is_vix_runtime_include() — skip them here.
+      if (is_vix_runtime_include(includePath))
+        return false;
+
+      if (isQuotedInclude)
+        return true;
+
+      if (includePath.find('/') != std::string::npos ||
+          includePath.find('\\') != std::string::npos)
+      {
+        return true;
+      }
+
+      return false;
+    }
+
     /**
      * @brief Return true when the script source layout is not suitable for direct mode.
      *