Add 64 sub-issue limit with automatic parent rotation (keeps old parents open)

[Copilot]

Implementation Complete: Parent Issue Sub-Issue Limit (64 max) ✅

Summary

Implemented automatic parent issue rotation when sub-issue count reaches 64, preventing GitHub API limits and maintaining clean issue organization. When a parent issue reaches capacity, it remains open and a new parent is created with a reference to the full parent.

Behavior

When a parent issue reaches 64 sub-issues:

• ✅ Old parent remains open with all its sub-issues visible
• ✅ New parent is created automatically
• ✅ New parent's description includes: > **Note:** This is a continuation parent issue. The previous parent issue #X reached the maximum of 64 sub-issues.
• ✅ Users can navigate between related parent issues to see full history

Implementation Details

Shared Helper (sub_issue_helpers.cjs):

• Exports MAX_SUB_ISSUES constant (64)
• Exports getSubIssueCount() - queries GraphQL for sub-issue counts
• Used by both workflow failure tracking and issue grouping features

Core Logic (handle_agent_failure.cjs):

• Imports from sub_issue_helpers.cjs
• Modified ensureParentIssue() - checks count before linking, creates new parent when limit reached (keeps old one open)
• New parent description includes reference to previous parent issue

Issue Grouping (create_issue.cjs):

• Imports from sub_issue_helpers.cjs
• Uses shared constant MAX_SUB_ISSUES instead of local constant

Test Coverage

• ✅ All 20 tests in handle_agent_failure.test.cjs passing
• ✅ All 9 tests in create_issue_group.test.cjs passing
• ✅ All 6 tests in sub_issue_helpers.test.cjs passing
• ✅ 2,807+ total tests passing

Validation

• ✅ Code review: All feedback addressed
• ✅ Security: CodeQL found no issues
• ✅ Tests: All passing
• ✅ Formatting: All files formatted with prettier

Original prompt

At @copilot, you're going to review the code that adds an issue when a workflow fails. And we're going to update the logic to check the parent issue. The parent issue cannot have more than 64 sub-issues, and if it does, you should close it and create a new one.

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[pelikhan]

@copilot move helper to helper file and reuse in create-issue group as well

[pelikhan]

@copilot do not close filled up parent, just create a new one and mention the old one in the description

[Copilot]

@copilot move helper to helper file and reuse in create-issue group as well

Done! Created sub_issue_helpers.cjs with shared getSubIssueCount() and MAX_SUB_ISSUES constant. Both handle_agent_failure.cjs and create_issue.cjs now import from this helper file, eliminating code duplication. (commit: 8e64cdd)

[Copilot]

@copilot do not close filled up parent, just create a new one and mention the old one in the description

Done! Changed behavior to keep full parent issues open instead of closing them. When a parent reaches 64 sub-issues, a new parent is created with a note in the description referencing the previous parent: > **Note:** This is a continuation parent issue. The previous parent issue #X reached the maximum of 64 sub-issues. (commit: 2951039)