ci: send slack message when ci fails on main

[arad-starkware]

This change is 

---

Note

Adds a reusable Slack notification workflow and hooks it into the main branch pipeline to alert when the test job fails.

• CI/CD:
  • New reusable workflow ./.github/workflows/notify-slack.yaml to send Slack alerts via incoming webhook on CI failure, parameterized by context_title and failed_job_name.
  • Main pipeline update in ./.github/workflows/on-merge.yaml:
    • Adds notify-slack job that runs after test and triggers only on failure, passing context for "main branch" and the failed job name.

^{Written by Cursor Bugbot for commit 193fe34. This will update automatically on new commits. Configure here.}

[arad-starkware]

• ci: send slack message when ci fails on main #60 👈 (View in Graphite)
• main

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[cursor]

Bug: Accidentally committed failing test

The test test_test appears to be accidentally committed debugging code. It only contains panic!("test") which will always fail, preventing CI from passing.

 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.63%. Comparing base (407cf62) to head (193fe34).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #60   +/-   ##
=======================================
  Coverage   95.63%   95.63%           
=======================================
  Files          45       45           
  Lines        9859     9859           
=======================================
  Hits         9429     9429           
  Misses        430      430           

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[NirLevi-starkware]

@NirLevi-starkware reviewed 4 of 4 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @noa-starkware)