fix(matrix): Strip AGP pre-release and select Kotlin by value

Two related bugs in the AGP -> Kotlin lookup:

1. `agpVersion >= minAgp` evaluates to false for pre-release AGP with
   the same major.minor.patch as a stable minAgp (semver rule:
   9.3.0-alpha01 < 9.3.0). Strip the pre-release identifier before
   the comparison so a row that should match isn't skipped.

2. `maxByOrNull { it.first }` picks the highest minAgp, not the
   highest Kotlin. Works by coincidence today under monotonic data
   but breaks on ties (e.g. Kotlin 1.4 and 1.5 both require AGP 7.0).
   Switch to `it.second` to select by Kotlin version directly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: romtsn

scripts/generate-compat-matrix.main.kts

@@ -102,11 +102,14 @@ class GenerateMatrix : CliktCommand() {
             put("agp", agpVersion.toString())
             val gradle = entry.value
 
-            // Pick the latest Kotlin whose required AGP <= this AGP
+            // Pick the latest Kotlin whose required AGP <= this AGP. Strip the pre-release
+            // identifier so 9.3.0-alpha01 isn't treated as < 9.3.0 by semver rules, which would
+            // skip a row that should match.
+            val agpStable = Version(agpVersion.major, agpVersion.minor, agpVersion.patch)
             val kotlinVersion =
               agpToKotlin
-                .filter { (minAgp, _) -> agpVersion >= minAgp }
-                .maxByOrNull { it.first }
+                .filter { (minAgp, _) -> agpStable >= minAgp }
+                .maxByOrNull { it.second }
                 ?.second
 
             // Floor: if the chosen Kotlin requires a newer Gradle than AGP does, bump Gradle up