Default-on issue intent metadata for set_issue_type, set_issue_field, and add_labels

[Copilot]

Three handlers (set_issue_type, set_issue_field, add_labels) gated intent metadata on config.issue_intent === true, silently discarding agent-supplied rationale/confidence when frontmatter was omitted — inconsistent with close_issue and assign_to_agent which default-on with !== false.

Handler changes

• set_issue_type / set_issue_field / add_labels: Change gate from config.issue_intent === true → config.issue_intent !== false. Omitted frontmatter now forwards metadata through the GraphQL/intent-aware path by default.

• add_labels strict mode: Introduce issueIntentStrict = config.issue_intent === true. When explicitly true, plain-string label names are rejected — agents must supply structured objects with intent fields. Default (omitted) accepts both strings and objects.

// Before: metadata silently dropped with omitted config
const issueIntentEnabled = config.issue_intent === true;  // false when omitted

// After: default-on, consistent with close_issue / assign_to_agent
const issueIntentEnabled = config.issue_intent !== false;  // true when omitted
const issueIntentStrict = config.issue_intent === true;    // add_labels strict mode

Schema

Added issue-intent: boolean property to add-labels, set-issue-type, and set-issue-field in main_workflow_schema.json. Previously the compiler rejected issue-intent frontmatter for these handlers, making opt-out (issue_intent: false) impossible via valid workflow syntax.

Tests

Added focused tests covering: omitted-config selects the intent path and forwards metadata; strict mode (true) rejects plain string labels; plain strings remain compatible in default mode; explicit disable (false) still selects the legacy REST path.

[github-actions]

Thanks for the clear PR description and for calling out the consistency issue with close_issue and assign_to_agent specifically. The change looks focused, the schema update is well-scoped, and the added handler tests make the behavioral intent easy to verify.

This PR looks ready for review — nice work tightening the default-on issue_intent behavior while preserving explicit opt-out semantics.

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