feat: add isolated Wurst benchmark mode

[Donach]

Adds a first-class isolated JVM benchmark worker mode to WurstScript.

• validates package-level, parameterless @benchmark functions returning int;
• allows one function to be both @test and @benchmark, while keeping @compiletime incompatible;
• discovers benchmarks separately and runs every measured fork in a fresh compiler JVM;
• performs initialization, warmup, calibration, and measured samples in a stable order;
• emits the private wurst-benchmark-worker-v2 contract with identity, checksum, batch size, and raw nanosecond samples only;
• rejects test-only -testFilter and -testTimeout options in benchmark mode;
• closes compile-time and native resources on both success and failure.

Verification from nix develop /home/daniel/Repositories/tever/tever_main on the final tree:

• rtk gradlew test — full compiler suite passed;
• rtk gradlew shadowJar — passed;
• companion Grill integration — stdlib typecheck passed, full quiet stdlib test suite passed, and targeted PolygonTests passed 22/22 with 0 compiler errors and 0 warnings;
• real Polygon comparison — 5 forks, 5 warmups, 20 measured iterations per fork, matching checksum 7907.

The final benchmark measured a 396,165,032 ns accelerated median versus 3,077,294,370 ns linear median: 7.77× median speedup. These are relative JVM-hosted Wurst IL interpreter measurements, not Warcraft III runtime numbers.

Companion CLI/documentation PR: wurstscript/WurstSetup#75. The built-in annotation declaration is proposed separately in wurstscript/WurstStdlib2.

[Donach]

Final controller-generated benchmark evidence from the exact content trees later squashed into the PR commits (tree hashes were checked unchanged after squash).

• Command: grill benchmark Polygon --forks 5 --warmup 5 --iterations 20 --format json
• Accelerated median: 396,165,032 ns/op
• Linear median: 3,077,294,370 ns/op
• Median speedup: 7.7677x
• Both checksums: 7907
• Samples: 100 per implementation across 5 isolated JVM forks
• Compiler JAR: sha256:830c5a70409b76af8fa2a90889a4604712d5fba443e5036d1eea9af94aa9dd8b
• Raw artifact SHA-256: f8cb89840a0d60d3ed7447a98afbd1f0d9ffa24810f86c494ae502eee0ec1d1f

Raw JSON artifact

{
  "schema": "wurst-benchmark-v1",
  "disclaimer": "Benchmark results measure the JVM-hosted Wurst IL interpreter. They vary with the machine, JVM, compiler version, host load, and benchmark setup. Use them for controlled side-by-side comparisons under the same conditions, not as absolute Warcraft III, Jass, Lua, or in-game performance numbers.",
  "environment": {
    "os": "Linux",
    "jvm": "25.0.2",
    "compiler": "sha256:830c5a70409b76af8fa2a90889a4604712d5fba443e5036d1eea9af94aa9dd8b",
    "grill": "1.4.0.0-nightly-master-4-g46b2d02",
    "cpuCount": 16
  },
  "filter": "Polygon",
  "forks": 5,
  "warmup": 5,
  "iterations": 20,
  "benchmarks": [
    {
      "qualifiedName": "PolygonTests.benchmarkAcceleratedClassification",
      "checksum": 7907,
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