test(routing): run full benchmark through Bash router

[jhuang-tw]

Summary

The repository has two independent structured-router entrypoints that both read the same routing.json SSoT:

• master-route.ps1
• master-route.sh

The PowerShell path already runs the full 163-case routing-benchmark.json in CI, while the Bash path currently checks only three hand-picked routes. That leaves room for semantic drift in Bash routing even when the shared route table itself is correct.

This PR keeps the change test-only and bounded:

• add skills/scripts/test-routing.sh, which runs every case from the existing routing-benchmark.json through master-route.sh and compares the emitted primary route with the shared expected value;
• replace the three inline Bash routing samples in CI with the full shared benchmark;
• keep the existing Bash case-init / case-guard regressions unchanged;
• add no new dependencies, runners, route rules, or production behavior.

Why

A recent macOS compatibility fix showed that the Bash path can fail independently of the PowerShell path. Running the same routing benchmark through both entrypoints turns the existing JSON benchmark into a true cross-entrypoint contract instead of validating only the PowerShell implementation.

Validation

The new runner is wired into the existing Ubuntu sh-syntax job. It uses the same Python 3 dependency already required by master-route.sh and reads the existing UTF-8 benchmark directly.

Expected CI contract after this change:

• PowerShell router: 163 shared benchmark cases
• Bash router: 163 shared benchmark cases
• existing Bash case-init/case-guard regressions remain in place

[dhicoc]

本地合并流程已完成：

1. 审查 diff（范围与动机成立）
2. git merge --no-ff 到本地 main（顺序 test(routing): run full benchmark through Bash router #69 → ci: exercise shell workflows on macOS system Bash #70 → fix(docs): clarify report flavor routing and evidence traceability #71）
3. skills/scripts/smoke.ps1 → ALL PASS
4. skills/scripts/verify-routing-coherence.ps1 → ALL PASS（含 fix(docs): clarify report flavor routing and evidence traceability #71 新增 vendor 规则断言）
5. push main

说明：本机 Windows 无系统 Bash，test-routing.sh 全量 benchmark 以 PR CI（Ubuntu）与 #69 设计为准；#70 的 macOS system Bash job 已在 PR CI 通过。