The plan.md workflow failed when creating sub-issues from issue comments because parseInt("#123", 10) returns NaN when the parent field contains GitHub's standard issue reference format with a # prefix.

Changes

• actions/setup/js/create_issue.cjs: Strip # prefix before parsing parent issue numbers
• actions/setup/js/create_issue.test.cjs: Add test coverage for all parent field formats

Example

// Before: Failed on "#123"
effectiveParentIssueNumber = parseInt(String(createIssueItem.parent), 10);

// After: Handles "#123", "123", and 123
const parentStr = String(createIssueItem.parent).trim();
const parentWithoutHash = parentStr.startsWith('#') ? parentStr.substring(1) : parentStr;
effectiveParentIssueNumber = parseInt(parentWithoutHash, 10);

The fix ensures parent-child issue relationships work correctly whether the parent is specified as a temporary ID ("aw_abc123def456"), a number with hash ("#123"), a string number ("123"), or an integer (123).

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