[review] Migrate set_issue_type safe output from GraphQL to single REST issues.update call

[github-actions]

Migrate set_issue_type safe output handler: GraphQL → REST issues.update

Summary

Migrates the set_issue_type safe-output handler from a GraphQL mutation to a single REST call (issues.update), preserving all existing validation, filtering, and error-mapping behaviour.

The review branch introduces one new file (a patch-level changeset entry); the full handler migration is carried in the branch commit history.

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What changed

Area	Detail
Handler	set_issue_type now calls the REST issues.update endpoint instead of the GraphQL mutation
Error mapping	REST error data parsing refactored; status type checks tightened to ensure canonical error types are returned
Type canonicalisation	Typing stabilised so the handler output shape is identical to the previous GraphQL path
Tests	Test suite updated to exercise the REST-based code path; naming polished for clarity
Changeset	patch-migrate-set-issue-type-rest.md added to record the release-level change

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Behaviour preserved

• Input validation and filtering are unchanged
• Error messages visible to callers remain the same
• Output shape / safe-output contract is unmodified

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Changeset

.changeset/patch-migrate-set-issue-type-rest.md  (added — patch)

Type: patch (non-breaking refactor)
Breaking: no

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Commit sequence

a5bb69df fix: migrate set_issue_type handler to REST issues.update
81049b82 test: update set_issue_type tests for REST issue type updates
d90d57f7 Fix set_issue_type REST error mapping and type canonicalization
d12e2776 Address remaining set_issue_type review follow-ups
0d8de742 Stabilize set_issue_type typing and error parsing
2990c7ef Refactor set_issue_type REST error data parsing
e90bb429 Tighten status type checks in set_issue_type
5ad89841 Polish set_issue_type naming and tests
ac755f5a Add changeset

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[github-actions]

Rebase onto main, then rerun the safe-output checks.

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