Align issue-intent rationale limits to GitHub’s 280-character API constraint

[Copilot]

Issue-intent rationales were unconstrained at schema level and capped at 1024 in runtime/validator code, while GitHub mutations enforce a 280-character maximum. This mismatch allowed oversized rationales to pass local validation and fail at mutation time.

• Schema constraints (safe outputs tools)

  • Added maxLength: 280 and updated field descriptions to explicitly state the limit for:
    • set_issue_type.rationale
    • set_issue_field.rationale
    • add_labels.labels[].rationale
    • remove_labels.labels[].rationale
    • update_issue.labels[].rationale
  • Applied in both runtime and embedded compiler copies of safe_outputs_tools.json to keep them in sync.

• Runtime normalization

  • Updated ISSUE_INTENT_RATIONALE_MAX_LENGTH in issue_intents.cjs from 1024 to 280.

• Validator sanitization

  • Updated issue-intent label rationale sanitization in safe_output_type_validator.cjs from maxLength: 1024 to maxLength: 280.

• Validator test expectations

  • Updated rationale max-length expectations in safe_output_type_validator.test.cjs from 1024 to 280.

// Before
const ISSUE_INTENT_RATIONALE_MAX_LENGTH = 1024;

// After
const ISSUE_INTENT_RATIONALE_MAX_LENGTH = 280;

[Copilot]

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