docs: update incremental benchmarks (2.5.1) (#203)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

generated/INCREMENTAL-BENCHMARKS.md

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+# Codegraph Incremental Build Benchmarks
+
+Self-measured on every release by running codegraph on its own codebase.
+Build tiers: full (cold), no-op (nothing changed), 1-file (single file modified).
+Import resolution: native batch vs JS fallback throughput.
+
+| Version | Engine | Files | Full Build | No-op | 1-File | Resolve (native) | Resolve (JS) |
+|---------|--------|------:|-----------:|------:|-------:|------------------:|-------------:|
+| 2.5.1 | native | 132 | 238ms | 4ms | 111ms | 1ms | 1ms |
+| 2.5.1 | wasm | 132 | 806ms | 4ms | 328ms | 1ms | 1ms |
+
+### Latest results
+
+**Version:** 2.5.1 | **Files:** 132 | **Date:** 2026-03-02
+
+#### Native (Rust)
+
+| Metric | Value |
+|--------|------:|
+| Full build | 238ms |
+| No-op rebuild | 4ms |
+| 1-file rebuild | 111ms |
+
+#### WASM
+
+| Metric | Value |
+|--------|------:|
+| Full build | 806ms |
+| No-op rebuild | 4ms |
+| 1-file rebuild | 328ms |
+
+#### Import Resolution
+
+| Metric | Value |
+|--------|------:|
+| Import pairs | 139 |
+| Native batch | 1ms |
+| JS fallback | 1ms |
+| Per-import (native) | 0ms |
+| Per-import (JS) | 0ms |
+| Speedup ratio | 1.1x |
+
+<!-- INCREMENTAL_BENCHMARK_DATA
+[
+  {
+    "version": "2.5.1",
+    "date": "2026-03-02",
+    "files": 132,
+    "wasm": {
+      "fullBuildMs": 806,
+      "noopRebuildMs": 4,
+      "oneFileRebuildMs": 328
+    },
+    "native": {
+      "fullBuildMs": 238,
+      "noopRebuildMs": 4,
+      "oneFileRebuildMs": 111
+    },
+    "resolve": {
+      "imports": 139,
+      "nativeBatchMs": 1.2,
+      "jsFallbackMs": 1.3,
+      "perImportNativeMs": 0,
+      "perImportJsMs": 0
+    }
+  }
+]
+-->