fix(analysis): replace fixed sleep with polling in ProjectInputReader

The fixed 100ms sleep was insufficient on CI after the TreeSitter v0.4.1
dependency bump (1.5 MB JAR), which slightly increased JVM startup time.
The upstream svnlogparser process no longer wrote its sync flag within
100ms, so modify read an empty stdin and skipped writing the output file.

Replace with a polling loop (50ms interval, 500ms max) that exits as soon
as data is available, making the pipe chain robust to JVM startup variance.

Author: Ulrike Kiesel

analysis/model/src/main/kotlin/de/maibornwolff/codecharta/serialization/ProjectInputReader.kt

@@ -8,17 +8,24 @@ import java.io.InputStreamReader
 import java.util.Scanner
 
 object ProjectInputReader {
-/**
+    private const val MAX_WAIT_MS = 500L
+    private const val CHECK_INTERVAL_MS = 50L
+
+    /**
      * Extracts a JSON string representing a project from the given InputStream.
      * Because piped bash commands run concurrently, a pipeable ccsh-parser sends a sync flag
      * to signal other parsers to check for piped input.
-     * A short wait ensures the availability of potential sync flags.
+     * Polls for data availability to handle concurrent JVM startup delays.
      *
      * @param input InputStream with serialized project data.
      * @return JSON string of the project, or an empty string if no valid data is found.
      */
     fun extractProjectString(input: InputStream): String {
-        Thread.sleep(100)
+        var waited = 0L
+        while (input.available() <= 0 && waited < MAX_WAIT_MS) {
+            Thread.sleep(CHECK_INTERVAL_MS)
+            waited += CHECK_INTERVAL_MS
+        }
         val availableBytes = input.available()
         if (availableBytes <= 0) {
             return ""