FE-1093: Harden orchestrator agent harness testing diagnostics

[kostandinang]

What

Adds profile-owned runner diagnostics for cook test execution.

Why

Runner/toolchain load failures, like Vitest being denied under confinement, should route as infra instead of product test failures.

Verification

• npx vitest run src/orchestrator/src/project-profile.test.ts src/orchestrator/src/test-runner.test.ts
• npm run verify reached the full test suite; unrelated graph type-contract tests timed out.

[kostandinang]

• FE-1093: Harden orchestrator agent harness testing diagnostics #269 👈 (View in Graphite)
• main

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[cursor]

PR Summary

Medium Risk
Changes how cook routes failed verify runs (infra vs test vs absent); misclassification could skip real reds or send infra to the wrong agent, though new tests target the tricky EPERM/assertion cases.

Overview
Each toolchain profile now carries RunnerDiagnostics (runnerName, runnerPackages, noTestsPatterns) so the cook harness can classify failures using stack-specific facts instead of hardcoded Vitest-only patterns.

classifyTestFailure takes those diagnostics and treats permission/load denials under profile-listed node_modules runner packages as infra, while keeping real assertion reds and unrelated EPERM (e.g. Playwright) as test. “No tests matched” wording is likewise profile-owned for the absent bucket. Spawn errors now also treat EACCES / EPERM as infra via isInfraSpawnError, with boundary checks so embedded error codes and assertion text are not misclassified.

ToolchainTestRunner passes this.toolchain.diagnostics into classification; tests cover runner-package EPERM, custom absent patterns, and registry expectations for package-backed vs built-in runners.

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