fix: avoid invalid v3 optimized schema refs

[darshan-Jahagirdar]

Fixes #1990.

This keeps asyncapi optimize --no-tty from producing invalid AsyncAPI 3.x documents when schema optimization rewrites nested/external schema refs into missing component refs. For AsyncAPI v3 documents, the CLI now adds the existing schema ignore mode automatically so non-schema optimizations can still run while preserving valid output.

Verification:

• npm run build
• npm run test:one -- test/integration/optimize.test.ts
• npm run lint
• git diff --check
• Manual repro: optimized test/fixtures/dummyspec/optimize-v3-invalid-output.yml, scanned for invalid schema refs, then validated the generated file successfully.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 03e1c82

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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0 Security Hotspots
0.0% Coverage on New Code
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[darshan-Jahagirdar]

Small follow-up on the changeset bot warning: a changeset is included now in 851f7b0 (.changeset/fix-v3-optimized-schema-refs.md). The warning above was posted against the earlier commit before that file was added.