[TypeSpec Authoring][Benchmark] eval multi trial

[JoyerJin]

No description provided.

[Copilot]

Pull request overview

This PR updates the azure-typespec-author benchmark/eval pipeline to support multi-trial (multi-run) evaluation, improves skill overlay checkout by using full git refs, and adds additional fixture dependency validation to reduce flaky/invalid eval runs.

Changes:

• Allow benchmark pipelines to run Vally suites with configurable --runs (and --workers) and increase job timeouts to accommodate longer runs.
• Make skill overlay more robust by accepting full branch refs (e.g., refs/heads/...) and checking out from FETCH_HEAD.
• Add a Node script + new eval graders to verify fixture node_modules presence and required TypeSpec packages before compiling.

Reviewed changes

Copilot reviewed 35 out of 35 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
eng/pipelines/templates/steps/typespec-author-eval-setup.yml	Switch SkillBranch default to full ref and normalize/fetch/checkout via FETCH_HEAD for robust skill overlay.
eng/pipelines/templates/steps/typespec-author-eval-run-suite.yml	Add Runs/Workers parameters and pass them to vally eval for multi-trial execution.
eng/pipelines/azure-typespec-author-benchmark.yml	Add EvalRuns pipeline parameter, pass Runs into suite steps, and increase timeouts.
eng/pipelines/azure-typespec-author-benchmark-no-skill.yml	Add EvalRuns pipeline parameter, pass Runs into suite steps, and increase timeouts.
.github/skills/azure-typespec-author/evaluate/scripts/report-eval-results.sh	Update reporting to group multi-trial results and summarize pass@k/flakiness.
.github/skills/azure-typespec-author/evaluate/scripts/check-node-dependencies.js	New script to validate fixture node_modules and required TypeSpec-related packages.
.github/skills/azure-typespec-author/evaluate/evals/005001.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders; loosen tool-call requirement pattern.
.github/skills/azure-typespec-author/evaluate/evals/004003.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders; loosen tool-call requirement pattern.
.github/skills/azure-typespec-author/evaluate/evals/004002.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/004001.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/003002.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/003001.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002011.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002010.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002009.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002008.eval.yaml	Copy dependency-check script; add run-command graders; tighten accepted ARM list-parameter patterns.
.github/skills/azure-typespec-author/evaluate/evals/002007.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002006.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002005.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002004.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002003.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002002.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/002001.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/001013.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/001011.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders; relax @renamedFrom match to allow namespace prefix.
.github/skills/azure-typespec-author/evaluate/evals/001010.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders; relax @removed match to allow namespace prefix.
.github/skills/azure-typespec-author/evaluate/evals/001009.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders; relax @madeRequired match to allow namespace prefix.
.github/skills/azure-typespec-author/evaluate/evals/001008.eval.yaml	Copy dependency-check script; add run-command graders; allow authoring-plan tool in place of web_fetch.
.github/skills/azure-typespec-author/evaluate/evals/001007.eval.yaml	Copy dependency-check script; add run-command graders; allow authoring-plan tool in place of web_fetch; relax decorator matches.
.github/skills/azure-typespec-author/evaluate/evals/001006.eval.yaml	Copy dependency-check script; add run-command graders; allow authoring-plan tool in place of web_fetch.
.github/skills/azure-typespec-author/evaluate/evals/001005.eval.yaml	Copy dependency-check script; add run-command graders; allow authoring-plan tool in place of web_fetch; relax decorator matches.
.github/skills/azure-typespec-author/evaluate/evals/001004.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/001003.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders.
.github/skills/azure-typespec-author/evaluate/evals/001002.eval.yaml	Copy dependency-check script; add run-command graders; relax decorator matches to allow namespace prefix.
.github/skills/azure-typespec-author/evaluate/evals/001001.eval.yaml	Copy dependency-check script into the sandbox; add run-command graders to forced stimulus.