test(fixtures): pin the TOOL_ABORTED message and keep the pwsh fixture replayable; restore trimmed testing.md clauses

scripts/doc-budgets.manifest.json

@@ -4,7 +4,7 @@
   "docs/architecture.md": 2160,
   "docs/cordis-primer.md": 600,
   "docs/defensive-patterns.md": 550,
-  "docs/testing.md": 1100,
+  "docs/testing.md": 1120,
   "examples/AGENTS.md": 310,
   "packages/AGENTS.md": 675,
   "packages/README.md": 920