Align strict-mode compatibility: allow Playwright MCP warnings and honor workflow-level strict opt-out for pull_request_target

[Copilot]

Bug Fix

What was the bug?

Daily compat runs exposed a strict-mode mismatch: workflows using tools.playwright in MCP mode failed hard in strict mode, and pull_request_target validation ignored per-workflow strict: false, causing post-codemod compile failures in real consumer repos.

How did you fix it?

• Playwright strict behavior

  • Changed validatePlaywrightMode to always emit a deprecation warning for MCP mode (including strict mode), instead of returning a strict-mode error.
  • This matches the requested behavior: MCP is deprecated, but still allowed in strict mode.

• pull_request_target strict consistency

  • Updated validatePullRequestTargetTrigger to compute effective strictness from compiler strict mode + workflow frontmatter override.
  • If frontmatter sets strict: false, strict-only hard error behavior is disabled for this validator, and insecure checkout remains a warning.

• Targeted regression coverage

  • Updated Playwright validation tests to expect warning-only behavior in strict mode.
  • Added a pull_request_target test case for --strict + frontmatter strict: false to assert warning-only behavior.

effectiveStrictMode := c.strictMode
if workflowData.RawFrontmatter != nil {
	if strictBool, ok := workflowData.RawFrontmatter["strict"].(bool); ok && !strictBool {
		effectiveStrictMode = false
	}
}

Testing

Behavior is covered by updated unit tests in:

• pkg/workflow/playwright_validation_test.go
• pkg/workflow/pull_request_target_validation_test.go

[Copilot]

Pull request overview

Adjusts strict-mode compatibility for two validators so consumer workflows don’t fail compilation unexpectedly while still surfacing security/deprecation guidance via warnings.

Changes:

• Playwright: allow deprecated MCP mode in strict mode by emitting a warning instead of returning an error.
• pull_request_target: honor workflow frontmatter strict: false as an opt-out for strict-only behavior even when strict mode is enabled via CLI, downgrading the insecure-checkout diagnostic from error to warning.
• Update/add unit tests for the new warning-only behaviors.

Show a summary per file

File	Description
pkg/workflow/pull_request_target_validation.go	Computes an effective strictness for this validator that honors frontmatter strict: false, and uses it to gate strict-only warnings/errors.
pkg/workflow/pull_request_target_validation_test.go	Adds a regression test for --strict + frontmatter strict: false expecting warning-only behavior.
pkg/workflow/playwright_validation.go	Changes MCP-mode handling to always warn (including strict mode) instead of erroring in strict mode.
pkg/workflow/playwright_validation_test.go	Updates strict-mode test cases to reflect warn-only behavior (but currently doesn’t assert warnings).

Copilot's findings

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• Files reviewed: 4/4 changed files
• Comments generated: 1