Add missing timeout configurations to CI workflows

[mr-raj12]

The problem

The CI workflows (.github/workflows/test.yml and .github/workflows/build-macos.yml) are missing timeout configurations on several jobs and steps. Without proper timeouts, these jobs can hang indefinitely, leading to:

• Wasted CI runner minutes (and costs)
• Delayed failure feedback for developers
• Blocked CI queues preventing other jobs from running

Currently:

• lint job (test.yml:20): No timeout configured (defaults to 360 minutes/6 hours)
• prepare-matrix job (test.yml:34): No timeout configured (defaults to 360 minutes/6 hours)
• tmate debug steps (test.yml:82-84, 130-132): No timeout configured (could hang indefinitely if debug mode is enabled)

While the project recently addressed major CI hang issues through comprehensive test mocking (PR #2353), the workflow timeout configurations themselves still have gaps that could allow jobs to run far longer than necessary.

Requested Solution

Add appropriate timeout-minutes configurations to all jobs and critical steps in CI workflows:

1. Add timeout-minutes: 15 to lint job (test.yml:20)

   • Linting with ruff typically completes in <2 minutes
   • 15 minutes provides buffer for slow runners or network issues

2. Add timeout-minutes: 5 to prepare-matrix job (test.yml:34)

   • Matrix generation is a simple bash script (runs in seconds)
   • 5 minutes is more than sufficient

3. Add timeout-minutes: 60 to tmate debug steps (test.yml:82-84, 130-132)

   • Prevents forgotten debug sessions from hanging for 6 hours
   • 60 minutes is reasonable for interactive debugging

Alternatives

• Keep current timeouts and rely solely on test mocking fixes from PR Fix test hangs on Linux/macOS CI by mocking system dependencies #2353

  • Downside: No protection against workflow-level hangs unrelated to test execution

• Use shorter timeouts (e.g., 10 minutes for lint, 3 minutes for prepare-matrix)

  • Downside: May be too aggressive and kill legitimate slow jobs

Additional context

Affected files:

• .github/workflows/test.yml (lines 20, 34, 82-84, 130-132)
• .github/workflows/build-macos.yml (optional: line 91 for artifact upload)

Current timeout status:

• ✅ test-unit job: 120 minutes (test.yml:59) - already configured
• ✅ test-integration job: 20 minutes (test.yml:112) - already configured
• ✅ build job: 120 minutes (build-macos.yml:25) - already configured
• ❌ lint, prepare-matrix, and tmate steps - missing timeouts

Related work:

• PR Fix test hangs on Linux/macOS CI by mocking system dependencies #2353 addressed test-level hangs through mocking
• This issue addresses workflow-level timeout configurations